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/nla-digbench/egcd2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-c6af20d [2019-09-03 21:09:04,249 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-09-03 21:09:04,251 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-09-03 21:09:04,262 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-09-03 21:09:04,262 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-09-03 21:09:04,263 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-09-03 21:09:04,265 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-09-03 21:09:04,266 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-09-03 21:09:04,268 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-09-03 21:09:04,269 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-09-03 21:09:04,270 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-09-03 21:09:04,271 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-09-03 21:09:04,271 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-09-03 21:09:04,272 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-09-03 21:09:04,273 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-09-03 21:09:04,274 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-09-03 21:09:04,275 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-09-03 21:09:04,276 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-09-03 21:09:04,277 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-09-03 21:09:04,279 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-09-03 21:09:04,281 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-09-03 21:09:04,282 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-09-03 21:09:04,283 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-09-03 21:09:04,284 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-09-03 21:09:04,286 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-09-03 21:09:04,289 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-09-03 21:09:04,289 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-09-03 21:09:04,290 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-09-03 21:09:04,291 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-09-03 21:09:04,292 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-09-03 21:09:04,292 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-09-03 21:09:04,293 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-09-03 21:09:04,293 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-09-03 21:09:04,293 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-09-03 21:09:04,294 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-09-03 21:09:04,295 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-09-03 21:09:04,295 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 [2019-09-03 21:09:04,310 INFO L113 SettingsManager]: Loading preferences was successful [2019-09-03 21:09:04,310 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-09-03 21:09:04,310 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2019-09-03 21:09:04,311 INFO L138 SettingsManager]: * Log level for plugins=info [2019-09-03 21:09:04,311 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2019-09-03 21:09:04,311 INFO L138 SettingsManager]: * User list type=DISABLED [2019-09-03 21:09:04,311 INFO L138 SettingsManager]: * Ignore calls to and inside polymorphic procedures=false [2019-09-03 21:09:04,312 INFO L138 SettingsManager]: * Ignore calls to recursive procedures=false [2019-09-03 21:09:04,312 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2019-09-03 21:09:04,312 INFO L138 SettingsManager]: * Abstract domain=IntervalDomain [2019-09-03 21:09:04,313 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-09-03 21:09:04,313 INFO L138 SettingsManager]: * sizeof long=4 [2019-09-03 21:09:04,313 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-09-03 21:09:04,313 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-09-03 21:09:04,313 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-09-03 21:09:04,314 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-09-03 21:09:04,314 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-09-03 21:09:04,314 INFO L138 SettingsManager]: * sizeof long double=12 [2019-09-03 21:09:04,314 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-09-03 21:09:04,314 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-09-03 21:09:04,315 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-09-03 21:09:04,315 INFO L138 SettingsManager]: * Remove goto edges from RCFG=true [2019-09-03 21:09:04,315 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-09-03 21:09:04,315 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-09-03 21:09:04,315 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-09-03 21:09:04,316 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-09-03 21:09:04,316 INFO L138 SettingsManager]: * Trace refinement strategy=TAIPAN [2019-09-03 21:09:04,316 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-09-03 21:09:04,316 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-09-03 21:09:04,316 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2019-09-03 21:09:04,343 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-09-03 21:09:04,356 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-09-03 21:09:04,358 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-09-03 21:09:04,360 INFO L271 PluginConnector]: Initializing CDTParser... [2019-09-03 21:09:04,360 INFO L275 PluginConnector]: CDTParser initialized [2019-09-03 21:09:04,361 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/egcd2.c [2019-09-03 21:09:04,417 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/096a1f94a/4eb4a1e3d77d4e0b8ea250cedde4e10a/FLAGfbba0a042 [2019-09-03 21:09:04,845 INFO L306 CDTParser]: Found 1 translation units. [2019-09-03 21:09:04,846 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/egcd2.c [2019-09-03 21:09:04,854 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/096a1f94a/4eb4a1e3d77d4e0b8ea250cedde4e10a/FLAGfbba0a042 [2019-09-03 21:09:05,228 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/096a1f94a/4eb4a1e3d77d4e0b8ea250cedde4e10a [2019-09-03 21:09:05,236 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-09-03 21:09:05,238 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-09-03 21:09:05,239 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-09-03 21:09:05,239 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-09-03 21:09:05,243 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-09-03 21:09:05,244 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 09:09:05" (1/1) ... [2019-09-03 21:09:05,247 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@49e5ebd0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:09:05, skipping insertion in model container [2019-09-03 21:09:05,247 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.09 09:09:05" (1/1) ... [2019-09-03 21:09:05,255 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-09-03 21:09:05,274 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-09-03 21:09:05,459 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 21:09:05,466 INFO L188 MainTranslator]: Completed pre-run [2019-09-03 21:09:05,486 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-09-03 21:09:05,497 INFO L192 MainTranslator]: Completed translation [2019-09-03 21:09:05,498 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:09:05 WrapperNode [2019-09-03 21:09:05,498 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-09-03 21:09:05,498 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-09-03 21:09:05,499 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-09-03 21:09:05,499 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-09-03 21:09:05,589 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:09:05" (1/1) ... [2019-09-03 21:09:05,589 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:09:05" (1/1) ... [2019-09-03 21:09:05,599 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:09:05" (1/1) ... [2019-09-03 21:09:05,600 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:09:05" (1/1) ... [2019-09-03 21:09:05,604 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:09:05" (1/1) ... [2019-09-03 21:09:05,609 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:09:05" (1/1) ... [2019-09-03 21:09:05,610 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:09:05" (1/1) ... [2019-09-03 21:09:05,612 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-09-03 21:09:05,613 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-09-03 21:09:05,613 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-09-03 21:09:05,613 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-09-03 21:09:05,614 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:09:05" (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 [2019-09-03 21:09:05,663 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-09-03 21:09:05,663 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-09-03 21:09:05,663 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-09-03 21:09:05,664 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-09-03 21:09:05,664 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-09-03 21:09:05,664 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-09-03 21:09:05,664 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-09-03 21:09:05,664 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-09-03 21:09:05,664 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-09-03 21:09:05,665 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-09-03 21:09:05,665 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-09-03 21:09:05,875 INFO L278 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-09-03 21:09:05,876 INFO L283 CfgBuilder]: Removed 2 assume(true) statements. [2019-09-03 21:09:05,878 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 09:09:05 BoogieIcfgContainer [2019-09-03 21:09:05,878 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-09-03 21:09:05,879 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-09-03 21:09:05,879 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-09-03 21:09:05,882 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-09-03 21:09:05,882 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.09 09:09:05" (1/3) ... [2019-09-03 21:09:05,883 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d3465a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.09 09:09:05, skipping insertion in model container [2019-09-03 21:09:05,883 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.09 09:09:05" (2/3) ... [2019-09-03 21:09:05,883 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3d3465a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.09 09:09:05, skipping insertion in model container [2019-09-03 21:09:05,884 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.09 09:09:05" (3/3) ... [2019-09-03 21:09:05,886 INFO L109 eAbstractionObserver]: Analyzing ICFG egcd2.c [2019-09-03 21:09:05,899 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-09-03 21:09:05,908 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-09-03 21:09:05,925 INFO L252 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-09-03 21:09:05,954 INFO L377 AbstractCegarLoop]: Interprodecural is true [2019-09-03 21:09:05,954 INFO L378 AbstractCegarLoop]: Hoare is false [2019-09-03 21:09:05,954 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-09-03 21:09:05,955 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-09-03 21:09:05,955 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-09-03 21:09:05,955 INFO L382 AbstractCegarLoop]: Difference is false [2019-09-03 21:09:05,955 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-09-03 21:09:05,955 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-09-03 21:09:05,975 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-09-03 21:09:05,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-09-03 21:09:05,995 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:09:05,996 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:09:05,999 INFO L418 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:09:06,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:09:06,008 INFO L82 PathProgramCache]: Analyzing trace with hash -558324168, now seen corresponding path program 1 times [2019-09-03 21:09:06,010 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:09:06,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:06,046 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:06,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:06,047 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:09:06,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:06,117 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:09:06,119 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-09-03 21:09:06,119 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-09-03 21:09:06,119 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-03 21:09:06,123 INFO L454 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-09-03 21:09:06,134 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-09-03 21:09:06,135 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-09-03 21:09:06,137 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 2 states. [2019-09-03 21:09:06,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:09:06,156 INFO L93 Difference]: Finished difference Result 27 states and 33 transitions. [2019-09-03 21:09:06,157 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-09-03 21:09:06,158 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-09-03 21:09:06,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:09:06,168 INFO L225 Difference]: With dead ends: 27 [2019-09-03 21:09:06,168 INFO L226 Difference]: Without dead ends: 22 [2019-09-03 21:09:06,170 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 [2019-09-03 21:09:06,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-09-03 21:09:06,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-09-03 21:09:06,207 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-09-03 21:09:06,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 28 transitions. [2019-09-03 21:09:06,210 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 28 transitions. Word has length 10 [2019-09-03 21:09:06,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:09:06,211 INFO L475 AbstractCegarLoop]: Abstraction has 22 states and 28 transitions. [2019-09-03 21:09:06,211 INFO L476 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-09-03 21:09:06,211 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 28 transitions. [2019-09-03 21:09:06,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2019-09-03 21:09:06,212 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:09:06,212 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:09:06,212 INFO L418 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:09:06,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:09:06,213 INFO L82 PathProgramCache]: Analyzing trace with hash -1008536757, now seen corresponding path program 1 times [2019-09-03 21:09:06,213 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:09:06,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:06,214 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:06,214 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:06,214 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:09:06,224 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-03 21:09:06,224 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-03 21:09:06,224 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_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 (exit command is (exit), workingDir is null) [2019-09-03 21:09:06,248 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:06,248 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-03 21:09:06,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:06,288 INFO L195 CegarAbsIntRunner]: Skipping current iteration for AI because the path program does not contain any loops [2019-09-03 21:09:06,289 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 21:09:06,290 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:09:06,290 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 [2019-09-03 21:09:06,324 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:06,324 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-03 21:09:06,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:06,357 INFO L256 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 3 conjunts are in the unsatisfiable core [2019-09-03 21:09:06,364 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:09:06,403 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:09:06,404 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:09:06,433 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:09:06,441 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-09-03 21:09:06,442 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 3 [2019-09-03 21:09:06,442 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-03 21:09:06,443 INFO L454 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-09-03 21:09:06,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-09-03 21:09:06,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-03 21:09:06,446 INFO L87 Difference]: Start difference. First operand 22 states and 28 transitions. Second operand 3 states. [2019-09-03 21:09:06,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:09:06,490 INFO L93 Difference]: Finished difference Result 31 states and 42 transitions. [2019-09-03 21:09:06,491 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-09-03 21:09:06,491 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2019-09-03 21:09:06,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:09:06,492 INFO L225 Difference]: With dead ends: 31 [2019-09-03 21:09:06,493 INFO L226 Difference]: Without dead ends: 31 [2019-09-03 21:09:06,494 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-09-03 21:09:06,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-09-03 21:09:06,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 24. [2019-09-03 21:09:06,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-09-03 21:09:06,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 30 transitions. [2019-09-03 21:09:06,510 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 30 transitions. Word has length 11 [2019-09-03 21:09:06,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:09:06,511 INFO L475 AbstractCegarLoop]: Abstraction has 24 states and 30 transitions. [2019-09-03 21:09:06,511 INFO L476 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-09-03 21:09:06,512 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 30 transitions. [2019-09-03 21:09:06,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2019-09-03 21:09:06,513 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:09:06,514 INFO L399 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:09:06,514 INFO L418 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:09:06,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:09:06,515 INFO L82 PathProgramCache]: Analyzing trace with hash -1182801044, now seen corresponding path program 1 times [2019-09-03 21:09:06,516 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:09:06,518 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:06,519 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:06,519 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:06,519 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:09:06,530 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-03 21:09:06,530 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-03 21:09:06,531 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_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 (exit command is (exit), workingDir is null) [2019-09-03 21:09:06,544 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:06,544 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-03 21:09:06,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:06,561 INFO L195 CegarAbsIntRunner]: Skipping current iteration for AI because the path program does not contain any loops [2019-09-03 21:09:06,561 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 21:09:06,562 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:09:06,562 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) [2019-09-03 21:09:06,577 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:06,577 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 21:09:06,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:06,594 INFO L256 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 11 conjunts are in the unsatisfiable core [2019-09-03 21:09:06,596 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:09:06,621 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:09:06,621 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:09:06,659 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:09:06,664 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-09-03 21:09:06,664 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 7 [2019-09-03 21:09:06,664 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-03 21:09:06,665 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-03 21:09:06,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-03 21:09:06,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-09-03 21:09:06,666 INFO L87 Difference]: Start difference. First operand 24 states and 30 transitions. Second operand 5 states. [2019-09-03 21:09:06,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:09:06,736 INFO L93 Difference]: Finished difference Result 35 states and 45 transitions. [2019-09-03 21:09:06,736 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-03 21:09:06,736 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 12 [2019-09-03 21:09:06,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:09:06,737 INFO L225 Difference]: With dead ends: 35 [2019-09-03 21:09:06,737 INFO L226 Difference]: Without dead ends: 35 [2019-09-03 21:09:06,738 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-09-03 21:09:06,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-09-03 21:09:06,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 30. [2019-09-03 21:09:06,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-09-03 21:09:06,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 36 transitions. [2019-09-03 21:09:06,745 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 36 transitions. Word has length 12 [2019-09-03 21:09:06,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:09:06,746 INFO L475 AbstractCegarLoop]: Abstraction has 30 states and 36 transitions. [2019-09-03 21:09:06,746 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-03 21:09:06,746 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 36 transitions. [2019-09-03 21:09:06,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-09-03 21:09:06,747 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:09:06,747 INFO L399 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:09:06,748 INFO L418 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:09:06,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:09:06,748 INFO L82 PathProgramCache]: Analyzing trace with hash -2031293851, now seen corresponding path program 1 times [2019-09-03 21:09:06,748 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:09:06,749 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:06,749 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:06,750 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:06,750 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:09:06,757 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-03 21:09:06,757 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-03 21:09:06,757 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-03 21:09:06,783 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:06,783 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) [2019-09-03 21:09:06,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:06,796 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 18 with the following transitions: [2019-09-03 21:09:06,798 INFO L207 CegarAbsIntRunner]: [0], [4], [13], [18], [27], [48], [51], [53], [56], [58], [59], [60], [61], [63], [64], [65] [2019-09-03 21:09:06,833 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-03 21:09:06,834 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-03 21:09:07,030 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-03 21:09:07,034 INFO L272 AbstractInterpreter]: Visited 15 different actions 15 times. Never merged. Never widened. Performed 55 root evaluator evaluations with a maximum evaluation depth of 8. Performed 55 inverse root evaluator evaluations with a maximum inverse evaluation depth of 8. Never found a fixpoint. Largest state had 12 variables. [2019-09-03 21:09:07,038 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:09:07,038 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-03 21:09:07,039 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:09:07,039 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 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 21:09:07,059 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:07,059 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-03 21:09:07,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:07,078 INFO L256 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 13 conjunts are in the unsatisfiable core [2019-09-03 21:09:07,080 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:09:07,126 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:09:07,127 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:09:07,178 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-09-03 21:09:07,182 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-09-03 21:09:07,182 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 8 [2019-09-03 21:09:07,182 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-03 21:09:07,183 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-03 21:09:07,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-03 21:09:07,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2019-09-03 21:09:07,183 INFO L87 Difference]: Start difference. First operand 30 states and 36 transitions. Second operand 5 states. [2019-09-03 21:09:07,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:09:07,255 INFO L93 Difference]: Finished difference Result 43 states and 54 transitions. [2019-09-03 21:09:07,256 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-03 21:09:07,256 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2019-09-03 21:09:07,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:09:07,259 INFO L225 Difference]: With dead ends: 43 [2019-09-03 21:09:07,259 INFO L226 Difference]: Without dead ends: 43 [2019-09-03 21:09:07,259 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-09-03 21:09:07,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-09-03 21:09:07,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2019-09-03 21:09:07,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-09-03 21:09:07,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 53 transitions. [2019-09-03 21:09:07,268 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 53 transitions. Word has length 17 [2019-09-03 21:09:07,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:09:07,268 INFO L475 AbstractCegarLoop]: Abstraction has 42 states and 53 transitions. [2019-09-03 21:09:07,268 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-03 21:09:07,268 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 53 transitions. [2019-09-03 21:09:07,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-09-03 21:09:07,269 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:09:07,269 INFO L399 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:09:07,270 INFO L418 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:09:07,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:09:07,270 INFO L82 PathProgramCache]: Analyzing trace with hash -71864628, now seen corresponding path program 1 times [2019-09-03 21:09:07,270 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:09:07,271 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:07,271 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:07,271 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:07,272 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:09:07,278 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-03 21:09:07,278 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-03 21:09:07,278 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2019-09-03 21:09:07,298 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:07,299 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-03 21:09:07,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:07,317 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 23 with the following transitions: [2019-09-03 21:09:07,317 INFO L207 CegarAbsIntRunner]: [0], [4], [13], [18], [27], [48], [51], [53], [56], [58], [59], [60], [61], [63], [64], [65], [66], [67] [2019-09-03 21:09:07,321 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-03 21:09:07,321 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-03 21:09:07,378 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-03 21:09:07,378 INFO L272 AbstractInterpreter]: Visited 15 different actions 15 times. Never merged. Never widened. Performed 55 root evaluator evaluations with a maximum evaluation depth of 8. Performed 55 inverse root evaluator evaluations with a maximum inverse evaluation depth of 8. Never found a fixpoint. Largest state had 12 variables. [2019-09-03 21:09:07,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:09:07,379 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-03 21:09:07,379 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:09:07,380 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 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 21:09:07,393 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:07,394 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-03 21:09:07,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:07,408 INFO L256 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 13 conjunts are in the unsatisfiable core [2019-09-03 21:09:07,410 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:09:07,447 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-09-03 21:09:07,447 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:09:07,498 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-09-03 21:09:07,501 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-09-03 21:09:07,502 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 8 [2019-09-03 21:09:07,502 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-03 21:09:07,502 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-03 21:09:07,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-03 21:09:07,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2019-09-03 21:09:07,503 INFO L87 Difference]: Start difference. First operand 42 states and 53 transitions. Second operand 5 states. [2019-09-03 21:09:07,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:09:07,565 INFO L93 Difference]: Finished difference Result 47 states and 57 transitions. [2019-09-03 21:09:07,565 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-09-03 21:09:07,565 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 22 [2019-09-03 21:09:07,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:09:07,567 INFO L225 Difference]: With dead ends: 47 [2019-09-03 21:09:07,567 INFO L226 Difference]: Without dead ends: 47 [2019-09-03 21:09:07,567 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-09-03 21:09:07,567 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2019-09-03 21:09:07,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 46. [2019-09-03 21:09:07,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-09-03 21:09:07,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 56 transitions. [2019-09-03 21:09:07,574 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 56 transitions. Word has length 22 [2019-09-03 21:09:07,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:09:07,575 INFO L475 AbstractCegarLoop]: Abstraction has 46 states and 56 transitions. [2019-09-03 21:09:07,575 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-03 21:09:07,575 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 56 transitions. [2019-09-03 21:09:07,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-09-03 21:09:07,576 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:09:07,576 INFO L399 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:09:07,576 INFO L418 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:09:07,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:09:07,577 INFO L82 PathProgramCache]: Analyzing trace with hash 954332139, now seen corresponding path program 1 times [2019-09-03 21:09:07,577 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:09:07,578 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:07,578 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:07,578 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:07,578 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:09:07,584 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-03 21:09:07,584 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-03 21:09:07,584 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-03 21:09:07,611 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:07,611 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) [2019-09-03 21:09:07,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:07,630 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 35 with the following transitions: [2019-09-03 21:09:07,631 INFO L207 CegarAbsIntRunner]: [0], [4], [13], [18], [27], [36], [48], [51], [53], [56], [58], [59], [60], [61], [63], [64], [65], [66], [67], [68], [69], [70] [2019-09-03 21:09:07,634 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-03 21:09:07,634 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-03 21:09:07,687 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-03 21:09:07,690 INFO L272 AbstractInterpreter]: Visited 15 different actions 15 times. Never merged. Never widened. Performed 55 root evaluator evaluations with a maximum evaluation depth of 8. Performed 55 inverse root evaluator evaluations with a maximum inverse evaluation depth of 8. Never found a fixpoint. Largest state had 12 variables. [2019-09-03 21:09:07,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:09:07,691 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-03 21:09:07,691 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:09:07,691 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 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 21:09:07,714 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:07,714 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 21:09:07,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:07,738 INFO L256 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 15 conjunts are in the unsatisfiable core [2019-09-03 21:09:07,741 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:09:07,803 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-09-03 21:09:07,803 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:09:07,875 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-09-03 21:09:07,878 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 21:09:07,878 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2019-09-03 21:09:07,879 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 21:09:07,879 INFO L454 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-09-03 21:09:07,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-09-03 21:09:07,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2019-09-03 21:09:07,880 INFO L87 Difference]: Start difference. First operand 46 states and 56 transitions. Second operand 9 states. [2019-09-03 21:09:08,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:09:08,030 INFO L93 Difference]: Finished difference Result 72 states and 99 transitions. [2019-09-03 21:09:08,030 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-09-03 21:09:08,030 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 34 [2019-09-03 21:09:08,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:09:08,032 INFO L225 Difference]: With dead ends: 72 [2019-09-03 21:09:08,032 INFO L226 Difference]: Without dead ends: 72 [2019-09-03 21:09:08,032 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 59 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2019-09-03 21:09:08,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2019-09-03 21:09:08,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 42. [2019-09-03 21:09:08,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-09-03 21:09:08,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2019-09-03 21:09:08,040 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 34 [2019-09-03 21:09:08,041 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:09:08,041 INFO L475 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2019-09-03 21:09:08,041 INFO L476 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-09-03 21:09:08,041 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2019-09-03 21:09:08,042 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2019-09-03 21:09:08,042 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:09:08,042 INFO L399 BasicCegarLoop]: trace histogram [5, 4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:09:08,043 INFO L418 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:09:08,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:09:08,043 INFO L82 PathProgramCache]: Analyzing trace with hash 286726549, now seen corresponding path program 1 times [2019-09-03 21:09:08,043 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:09:08,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:08,044 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:08,044 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:08,045 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:09:08,050 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-03 21:09:08,050 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-03 21:09:08,050 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-03 21:09:08,068 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:08,068 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) [2019-09-03 21:09:08,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:08,080 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 37 with the following transitions: [2019-09-03 21:09:08,081 INFO L207 CegarAbsIntRunner]: [0], [4], [13], [16], [18], [27], [34], [40], [48], [51], [53], [56], [58], [59], [60], [61], [63], [64], [65], [66], [67], [68], [69], [70], [71] [2019-09-03 21:09:08,084 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-03 21:09:08,084 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-03 21:09:08,108 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-03 21:09:08,108 INFO L272 AbstractInterpreter]: Visited 17 different actions 22 times. Never merged. Never widened. Performed 61 root evaluator evaluations with a maximum evaluation depth of 8. Performed 61 inverse root evaluator evaluations with a maximum inverse evaluation depth of 8. Never found a fixpoint. Largest state had 13 variables. [2019-09-03 21:09:08,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:09:08,109 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-03 21:09:08,109 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:09:08,109 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 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 21:09:08,126 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:08,126 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 21:09:08,143 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:08,144 INFO L256 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 5 conjunts are in the unsatisfiable core [2019-09-03 21:09:08,146 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:09:08,175 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-09-03 21:09:08,175 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:09:08,214 INFO L134 CoverageAnalysis]: Checked inductivity of 34 backedges. 8 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-09-03 21:09:08,218 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 21:09:08,218 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 5 [2019-09-03 21:09:08,218 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 21:09:08,219 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-03 21:09:08,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-03 21:09:08,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-09-03 21:09:08,220 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 5 states. [2019-09-03 21:09:08,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:09:08,327 INFO L93 Difference]: Finished difference Result 81 states and 116 transitions. [2019-09-03 21:09:08,332 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-03 21:09:08,332 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 36 [2019-09-03 21:09:08,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:09:08,334 INFO L225 Difference]: With dead ends: 81 [2019-09-03 21:09:08,334 INFO L226 Difference]: Without dead ends: 81 [2019-09-03 21:09:08,334 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 65 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2019-09-03 21:09:08,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2019-09-03 21:09:08,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 72. [2019-09-03 21:09:08,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2019-09-03 21:09:08,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 101 transitions. [2019-09-03 21:09:08,346 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 101 transitions. Word has length 36 [2019-09-03 21:09:08,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:09:08,347 INFO L475 AbstractCegarLoop]: Abstraction has 72 states and 101 transitions. [2019-09-03 21:09:08,347 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-03 21:09:08,347 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 101 transitions. [2019-09-03 21:09:08,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-09-03 21:09:08,348 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:09:08,349 INFO L399 BasicCegarLoop]: trace histogram [6, 5, 5, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:09:08,350 INFO L418 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:09:08,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:09:08,350 INFO L82 PathProgramCache]: Analyzing trace with hash -1803964113, now seen corresponding path program 1 times [2019-09-03 21:09:08,350 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:09:08,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:08,351 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:08,351 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:08,352 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:09:08,359 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-03 21:09:08,359 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-03 21:09:08,359 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-03 21:09:08,377 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:08,377 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) [2019-09-03 21:09:08,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:08,393 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 43 with the following transitions: [2019-09-03 21:09:08,393 INFO L207 CegarAbsIntRunner]: [0], [4], [13], [18], [27], [34], [40], [48], [51], [53], [56], [58], [59], [60], [61], [63], [64], [65], [66], [67], [68], [69], [70] [2019-09-03 21:09:08,397 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-03 21:09:08,397 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-03 21:09:08,433 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-03 21:09:08,433 INFO L272 AbstractInterpreter]: Visited 15 different actions 15 times. Never merged. Never widened. Performed 55 root evaluator evaluations with a maximum evaluation depth of 8. Performed 55 inverse root evaluator evaluations with a maximum inverse evaluation depth of 8. Never found a fixpoint. Largest state had 13 variables. [2019-09-03 21:09:08,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:09:08,434 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-03 21:09:08,434 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:09:08,434 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 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 21:09:08,458 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:08,458 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-03 21:09:08,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:08,478 INFO L256 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 19 conjunts are in the unsatisfiable core [2019-09-03 21:09:08,481 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:09:08,525 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-09-03 21:09:08,526 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:09:08,584 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 10 proven. 5 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-09-03 21:09:08,587 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 21:09:08,587 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 10 [2019-09-03 21:09:08,587 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 21:09:08,588 INFO L454 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-09-03 21:09:08,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-09-03 21:09:08,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2019-09-03 21:09:08,589 INFO L87 Difference]: Start difference. First operand 72 states and 101 transitions. Second operand 10 states. [2019-09-03 21:09:09,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:09:09,468 INFO L93 Difference]: Finished difference Result 111 states and 161 transitions. [2019-09-03 21:09:09,468 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-09-03 21:09:09,469 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 42 [2019-09-03 21:09:09,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:09:09,470 INFO L225 Difference]: With dead ends: 111 [2019-09-03 21:09:09,470 INFO L226 Difference]: Without dead ends: 110 [2019-09-03 21:09:09,471 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2019-09-03 21:09:09,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2019-09-03 21:09:09,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 107. [2019-09-03 21:09:09,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2019-09-03 21:09:09,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 156 transitions. [2019-09-03 21:09:09,485 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 156 transitions. Word has length 42 [2019-09-03 21:09:09,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:09:09,485 INFO L475 AbstractCegarLoop]: Abstraction has 107 states and 156 transitions. [2019-09-03 21:09:09,485 INFO L476 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-09-03 21:09:09,485 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 156 transitions. [2019-09-03 21:09:09,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-09-03 21:09:09,487 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:09:09,487 INFO L399 BasicCegarLoop]: trace histogram [7, 6, 6, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:09:09,487 INFO L418 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:09:09,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:09:09,488 INFO L82 PathProgramCache]: Analyzing trace with hash -1108781502, now seen corresponding path program 2 times [2019-09-03 21:09:09,488 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:09:09,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:09,489 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:09,489 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:09,489 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:09:09,498 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-03 21:09:09,498 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-03 21:09:09,498 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-03 21:09:09,513 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 21:09:09,513 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) [2019-09-03 21:09:09,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:09,540 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 21:09:09,541 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 21:09:09,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:09:09,541 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 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 21:09:09,550 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 21:09:09,550 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2019-09-03 21:09:09,574 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-09-03 21:09:09,574 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 21:09:09,575 INFO L256 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 27 conjunts are in the unsatisfiable core [2019-09-03 21:09:09,577 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:09:09,674 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2019-09-03 21:09:09,675 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:09:09,798 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [MP z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (17)] Exception during sending of exit command (exit): Broken pipe [2019-09-03 21:09:09,803 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 21:09:09,803 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2019-09-03 21:09:09,803 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 21:09:09,804 INFO L454 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-09-03 21:09:09,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-09-03 21:09:09,805 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2019-09-03 21:09:09,805 INFO L87 Difference]: Start difference. First operand 107 states and 156 transitions. Second operand 12 states. [2019-09-03 21:09:10,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:09:10,748 INFO L93 Difference]: Finished difference Result 166 states and 245 transitions. [2019-09-03 21:09:10,748 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-09-03 21:09:10,749 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 47 [2019-09-03 21:09:10,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:09:10,751 INFO L225 Difference]: With dead ends: 166 [2019-09-03 21:09:10,751 INFO L226 Difference]: Without dead ends: 165 [2019-09-03 21:09:10,752 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=167, Unknown=0, NotChecked=0, Total=210 [2019-09-03 21:09:10,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2019-09-03 21:09:10,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 160. [2019-09-03 21:09:10,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2019-09-03 21:09:10,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 238 transitions. [2019-09-03 21:09:10,779 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 238 transitions. Word has length 47 [2019-09-03 21:09:10,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:09:10,779 INFO L475 AbstractCegarLoop]: Abstraction has 160 states and 238 transitions. [2019-09-03 21:09:10,780 INFO L476 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-09-03 21:09:10,780 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 238 transitions. [2019-09-03 21:09:10,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-09-03 21:09:10,784 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:09:10,785 INFO L399 BasicCegarLoop]: trace histogram [9, 8, 8, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:09:10,785 INFO L418 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:09:10,785 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:09:10,785 INFO L82 PathProgramCache]: Analyzing trace with hash -1556128492, now seen corresponding path program 1 times [2019-09-03 21:09:10,785 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:09:10,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:10,786 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 21:09:10,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:10,787 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:09:10,791 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-03 21:09:10,791 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-03 21:09:10,792 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-03 21:09:10,803 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:10,803 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) [2019-09-03 21:09:10,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:10,818 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 59 with the following transitions: [2019-09-03 21:09:10,819 INFO L207 CegarAbsIntRunner]: [0], [4], [13], [16], [18], [27], [34], [36], [40], [48], [51], [53], [56], [58], [59], [60], [61], [63], [64], [65], [66], [67], [68], [69], [70], [71] [2019-09-03 21:09:10,823 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-03 21:09:10,823 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-03 21:09:10,840 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-03 21:09:10,841 INFO L272 AbstractInterpreter]: Visited 17 different actions 22 times. Never merged. Never widened. Performed 61 root evaluator evaluations with a maximum evaluation depth of 8. Performed 61 inverse root evaluator evaluations with a maximum inverse evaluation depth of 8. Never found a fixpoint. Largest state had 13 variables. [2019-09-03 21:09:10,841 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:09:10,841 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-03 21:09:10,841 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:09:10,841 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 21:09:10,859 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:10,859 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-03 21:09:10,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:10,882 INFO L256 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 37 conjunts are in the unsatisfiable core [2019-09-03 21:09:10,885 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:09:11,019 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-09-03 21:09:11,020 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:09:11,200 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 16 proven. 8 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2019-09-03 21:09:11,208 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 21:09:11,209 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2019-09-03 21:09:11,209 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 21:09:11,209 INFO L454 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-09-03 21:09:11,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-09-03 21:09:11,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2019-09-03 21:09:11,211 INFO L87 Difference]: Start difference. First operand 160 states and 238 transitions. Second operand 16 states. [2019-09-03 21:09:12,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:09:12,634 INFO L93 Difference]: Finished difference Result 278 states and 429 transitions. [2019-09-03 21:09:12,635 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-09-03 21:09:12,635 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 58 [2019-09-03 21:09:12,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:09:12,639 INFO L225 Difference]: With dead ends: 278 [2019-09-03 21:09:12,639 INFO L226 Difference]: Without dead ends: 276 [2019-09-03 21:09:12,640 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 101 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=186, Invalid=806, Unknown=0, NotChecked=0, Total=992 [2019-09-03 21:09:12,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2019-09-03 21:09:12,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 272. [2019-09-03 21:09:12,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2019-09-03 21:09:12,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 420 transitions. [2019-09-03 21:09:12,664 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 420 transitions. Word has length 58 [2019-09-03 21:09:12,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:09:12,664 INFO L475 AbstractCegarLoop]: Abstraction has 272 states and 420 transitions. [2019-09-03 21:09:12,664 INFO L476 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-09-03 21:09:12,664 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 420 transitions. [2019-09-03 21:09:12,666 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2019-09-03 21:09:12,666 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:09:12,666 INFO L399 BasicCegarLoop]: trace histogram [11, 10, 10, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:09:12,667 INFO L418 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:09:12,667 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:09:12,667 INFO L82 PathProgramCache]: Analyzing trace with hash 419798924, now seen corresponding path program 3 times [2019-09-03 21:09:12,667 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:09:12,668 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:12,668 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:12,668 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:12,668 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:09:12,673 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-03 21:09:12,673 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-03 21:09:12,673 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-03 21:09:12,690 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 21:09:12,690 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) [2019-09-03 21:09:12,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:12,709 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 21:09:12,709 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 21:09:12,709 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:09:12,709 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 21:09:12,725 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2019-09-03 21:09:12,725 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 21:09:12,748 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-09-03 21:09:12,748 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 21:09:12,749 INFO L256 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 5 conjunts are in the unsatisfiable core [2019-09-03 21:09:12,751 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:09:12,801 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 101 proven. 0 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2019-09-03 21:09:12,801 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:09:12,853 INFO L134 CoverageAnalysis]: Checked inductivity of 221 backedges. 41 proven. 0 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2019-09-03 21:09:12,856 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 0 imperfect interpolant sequences. [2019-09-03 21:09:12,856 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [] total 8 [2019-09-03 21:09:12,856 INFO L257 anRefinementStrategy]: Using the first perfect interpolant sequence [2019-09-03 21:09:12,857 INFO L454 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-09-03 21:09:12,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-09-03 21:09:12,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2019-09-03 21:09:12,858 INFO L87 Difference]: Start difference. First operand 272 states and 420 transitions. Second operand 5 states. [2019-09-03 21:09:12,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:09:12,923 INFO L93 Difference]: Finished difference Result 197 states and 288 transitions. [2019-09-03 21:09:12,923 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-09-03 21:09:12,923 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 72 [2019-09-03 21:09:12,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:09:12,925 INFO L225 Difference]: With dead ends: 197 [2019-09-03 21:09:12,925 INFO L226 Difference]: Without dead ends: 197 [2019-09-03 21:09:12,926 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2019-09-03 21:09:12,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2019-09-03 21:09:12,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 197. [2019-09-03 21:09:12,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 197 states. [2019-09-03 21:09:12,940 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 197 states to 197 states and 288 transitions. [2019-09-03 21:09:12,940 INFO L78 Accepts]: Start accepts. Automaton has 197 states and 288 transitions. Word has length 72 [2019-09-03 21:09:12,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:09:12,941 INFO L475 AbstractCegarLoop]: Abstraction has 197 states and 288 transitions. [2019-09-03 21:09:12,941 INFO L476 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-09-03 21:09:12,941 INFO L276 IsEmpty]: Start isEmpty. Operand 197 states and 288 transitions. [2019-09-03 21:09:12,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2019-09-03 21:09:12,946 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:09:12,946 INFO L399 BasicCegarLoop]: trace histogram [15, 14, 14, 4, 4, 4, 4, 4, 4, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:09:12,946 INFO L418 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:09:12,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:09:12,947 INFO L82 PathProgramCache]: Analyzing trace with hash 135833028, now seen corresponding path program 1 times [2019-09-03 21:09:12,947 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:09:12,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:12,951 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 21:09:12,951 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:12,951 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:09:12,958 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-03 21:09:12,959 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-03 21:09:12,959 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-03 21:09:12,989 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:12,989 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) [2019-09-03 21:09:13,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:13,015 INFO L205 CegarAbsIntRunner]: Running AI on error trace of length 92 with the following transitions: [2019-09-03 21:09:13,015 INFO L207 CegarAbsIntRunner]: [0], [4], [13], [18], [27], [34], [36], [40], [48], [51], [53], [56], [58], [59], [60], [61], [63], [64], [65], [66], [67], [68], [69], [70] [2019-09-03 21:09:13,017 INFO L148 AbstractInterpreter]: Using domain IntervalDomain [2019-09-03 21:09:13,017 INFO L101 FixpointEngine]: Starting fixpoint engine with domain IntervalDomain (maxUnwinding=3, maxParallelStates=2) [2019-09-03 21:09:13,032 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2019-09-03 21:09:13,032 INFO L272 AbstractInterpreter]: Visited 15 different actions 15 times. Never merged. Never widened. Performed 55 root evaluator evaluations with a maximum evaluation depth of 8. Performed 55 inverse root evaluator evaluations with a maximum inverse evaluation depth of 8. Never found a fixpoint. Largest state had 13 variables. [2019-09-03 21:09:13,032 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:09:13,032 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-09-03 21:09:13,033 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:09:13,033 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 21:09:13,051 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:13,051 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2019-09-03 21:09:13,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:13,087 INFO L256 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 39 conjunts are in the unsatisfiable core [2019-09-03 21:09:13,091 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:09:13,318 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 28 proven. 32 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2019-09-03 21:09:13,319 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:09:13,664 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 28 proven. 32 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2019-09-03 21:09:13,678 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 21:09:13,678 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2019-09-03 21:09:13,678 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 21:09:13,680 INFO L454 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-09-03 21:09:13,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-09-03 21:09:13,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2019-09-03 21:09:13,681 INFO L87 Difference]: Start difference. First operand 197 states and 288 transitions. Second operand 16 states. [2019-09-03 21:09:14,346 WARN L188 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 38 [2019-09-03 21:09:15,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-09-03 21:09:15,070 INFO L93 Difference]: Finished difference Result 228 states and 331 transitions. [2019-09-03 21:09:15,070 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-09-03 21:09:15,070 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 91 [2019-09-03 21:09:15,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-09-03 21:09:15,072 INFO L225 Difference]: With dead ends: 228 [2019-09-03 21:09:15,072 INFO L226 Difference]: Without dead ends: 220 [2019-09-03 21:09:15,073 INFO L628 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=125, Invalid=475, Unknown=0, NotChecked=0, Total=600 [2019-09-03 21:09:15,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2019-09-03 21:09:15,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 196. [2019-09-03 21:09:15,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2019-09-03 21:09:15,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 283 transitions. [2019-09-03 21:09:15,094 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 283 transitions. Word has length 91 [2019-09-03 21:09:15,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-09-03 21:09:15,096 INFO L475 AbstractCegarLoop]: Abstraction has 196 states and 283 transitions. [2019-09-03 21:09:15,096 INFO L476 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-09-03 21:09:15,096 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 283 transitions. [2019-09-03 21:09:15,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2019-09-03 21:09:15,100 INFO L391 BasicCegarLoop]: Found error trace [2019-09-03 21:09:15,100 INFO L399 BasicCegarLoop]: trace histogram [17, 16, 16, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-09-03 21:09:15,100 INFO L418 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-09-03 21:09:15,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-09-03 21:09:15,101 INFO L82 PathProgramCache]: Analyzing trace with hash -1549930679, now seen corresponding path program 2 times [2019-09-03 21:09:15,101 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2019-09-03 21:09:15,102 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:15,103 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-09-03 21:09:15,103 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2019-09-03 21:09:15,103 INFO L289 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2019-09-03 21:09:15,116 ERROR L235 seRefinementStrategy]: Caught known exception: Unsupported non-linear arithmetic [2019-09-03 21:09:15,116 INFO L258 seRefinementStrategy]: Advancing trace checker [2019-09-03 21:09:15,116 INFO L170 anRefinementStrategy]: Switched to traceCheck mode Z3_NO_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2019-09-03 21:09:15,132 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2019-09-03 21:09:15,133 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_NO_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-09-03 21:09:15,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-09-03 21:09:15,165 INFO L189 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2019-09-03 21:09:15,165 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2019-09-03 21:09:15,165 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2019-09-03 21:09:15,166 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 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2019-09-03 21:09:15,182 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2019-09-03 21:09:15,182 INFO L289 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2019-09-03 21:09:15,222 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-09-03 21:09:15,223 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-09-03 21:09:15,224 INFO L256 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 58 conjunts are in the unsatisfiable core [2019-09-03 21:09:15,227 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-09-03 21:09:15,366 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 21:09:15,425 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 67 proven. 43 refuted. 0 times theorem prover too weak. 445 trivial. 0 not checked. [2019-09-03 21:09:15,425 INFO L322 TraceCheckSpWp]: Computing backward predicates... [2019-09-03 21:09:15,545 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 21:09:15,579 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-09-03 21:09:18,338 INFO L134 CoverageAnalysis]: Checked inductivity of 555 backedges. 67 proven. 47 refuted. 0 times theorem prover too weak. 441 trivial. 0 not checked. [2019-09-03 21:09:18,341 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-09-03 21:09:18,341 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 21 [2019-09-03 21:09:18,342 INFO L250 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2019-09-03 21:09:18,342 INFO L454 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-09-03 21:09:18,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-09-03 21:09:18,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=355, Unknown=1, NotChecked=0, Total=420 [2019-09-03 21:09:18,343 INFO L87 Difference]: Start difference. First operand 196 states and 283 transitions. Second operand 21 states. [2019-09-03 21:09:37,667 WARN L188 SmtUtils]: Spent 8.04 s on a formula simplification that was a NOOP. DAG size: 55 [2019-09-03 21:09:54,562 WARN L188 SmtUtils]: Spent 260.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2019-09-03 21:10:10,792 WARN L188 SmtUtils]: Spent 6.05 s on a formula simplification that was a NOOP. DAG size: 44 [2019-09-03 21:10:29,155 WARN L188 SmtUtils]: Spent 14.42 s on a formula simplification that was a NOOP. DAG size: 68 [2019-09-03 21:10:31,200 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse1 (= 0 (+ (* (+ c_main_~p~0 (- (* c_main_~q~0 c_main_~k~0))) c_main_~x~0) (* c_main_~y~0 (+ (- (* c_main_~k~0 c_main_~s~0)) c_main_~r~0)))))) (and (= c_main_~s~0 1) (forall ((main_~k~0 Int)) (let ((.cse0 (+ main_~k~0 1))) (or (= (+ (* c_main_~x~0 (+ c_main_~p~0 (- (* c_main_~q~0 .cse0)))) (* (+ c_main_~r~0 (- (* c_main_~s~0 .cse0))) c_main_~y~0)) 0) (not (= c_main_~a~0 (+ 0 (* c_main_~b~0 .cse0))))))) (= (+ c_main_~b~0 (* (- c_main_~q~0) c_main_~x~0)) c_main_~y~0) (<= 1 c_main_~x~0) (or .cse1 (not (= c_main_~c~0 0))) (forall ((v_subst_2 Int)) (let ((.cse2 (+ v_subst_2 1))) (or (= 0 (+ (* (+ c_main_~q~0 (- (* c_main_~p~0 .cse2))) c_main_~x~0) (* (+ c_main_~s~0 (- (* c_main_~r~0 .cse2))) c_main_~y~0))) (not (= (+ (* c_main_~a~0 .cse2) 0) c_main_~b~0))))) (or .cse1 (not (= c_main_~a~0 (+ 0 (* c_main_~b~0 c_main_~k~0))))) (forall ((v_subst_2 Int)) (let ((.cse3 (+ v_subst_2 1))) (or (= (+ (* c_main_~y~0 (+ c_main_~s~0 (- (* .cse3 (+ (- (* c_main_~k~0 c_main_~s~0)) c_main_~r~0))))) (* (+ (- (* (+ c_main_~p~0 (- (* c_main_~q~0 c_main_~k~0))) .cse3)) c_main_~q~0) c_main_~x~0)) 0) (not (= (+ (* c_main_~c~0 .cse3) 0) c_main_~b~0))))))) is different from false [2019-09-03 21:10:33,210 WARN L838 $PredicateComparison]: unable to prove that (and (forall ((main_~k~0 Int)) (let ((.cse0 (+ main_~k~0 1))) (or (= (+ (* c_main_~x~0 (+ c_main_~p~0 (- (* c_main_~q~0 .cse0)))) (* (+ c_main_~r~0 (- (* c_main_~s~0 .cse0))) c_main_~y~0)) 0) (not (= c_main_~a~0 (+ 0 (* c_main_~b~0 .cse0))))))) (or (= 0 (+ (* (+ c_main_~p~0 (- (* c_main_~q~0 c_main_~k~0))) c_main_~x~0) (* c_main_~y~0 (+ (- (* c_main_~k~0 c_main_~s~0)) c_main_~r~0)))) (not (= c_main_~a~0 (+ 0 (* c_main_~b~0 c_main_~k~0))))) (forall ((v_subst_2 Int)) (let ((.cse1 (+ v_subst_2 1))) (or (= (+ (* c_main_~y~0 (+ c_main_~s~0 (- (* .cse1 (+ (- (* c_main_~k~0 c_main_~s~0)) c_main_~r~0))))) (* (+ (- (* (+ c_main_~p~0 (- (* c_main_~q~0 c_main_~k~0))) .cse1)) c_main_~q~0) c_main_~x~0)) 0) (not (= (+ (* c_main_~c~0 .cse1) 0) c_main_~b~0)))))) is different from false [2019-09-03 21:11:14,150 WARN L188 SmtUtils]: Spent 4.10 s on a formula simplification that was a NOOP. DAG size: 48