/usr/bin/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/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench/ps4.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 21:26:37,457 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 21:26:37,459 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 21:26:37,471 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 21:26:37,471 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 21:26:37,472 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 21:26:37,474 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 21:26:37,475 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 21:26:37,477 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 21:26:37,478 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 21:26:37,479 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 21:26:37,480 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 21:26:37,480 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 21:26:37,481 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 21:26:37,482 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 21:26:37,483 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 21:26:37,483 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 21:26:37,484 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 21:26:37,486 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 21:26:37,488 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 21:26:37,489 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 21:26:37,490 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 21:26:37,491 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 21:26:37,492 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 21:26:37,494 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-11-06 21:26:37,494 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-11-06 21:26:37,494 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-11-06 21:26:37,495 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-11-06 21:26:37,496 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-11-06 21:26:37,496 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-11-06 21:26:37,497 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-06 21:26:37,497 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-06 21:26:37,498 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-06 21:26:37,499 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-06 21:26:37,500 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-06 21:26:37,500 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-06 21:26:37,500 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-06 21:26:37,501 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-06 21:26:37,501 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 21:26:37,502 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 21:26:37,502 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 21:26:37,503 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-06 21:26:37,518 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 21:26:37,519 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 21:26:37,520 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 21:26:37,520 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 21:26:37,520 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 21:26:37,520 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 21:26:37,521 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 21:26:37,521 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 21:26:37,521 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 21:26:37,521 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 21:26:37,521 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 21:26:37,521 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 21:26:37,522 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 21:26:37,522 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 21:26:37,522 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 21:26:37,522 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 21:26:37,522 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 21:26:37,523 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 21:26:37,523 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 21:26:37,523 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 21:26:37,523 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 21:26:37,523 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 21:26:37,524 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 21:26:37,524 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 21:26:37,524 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 21:26:37,524 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 21:26:37,524 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 21:26:37,525 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 21:26:37,525 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 21:26:37,794 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 21:26:37,806 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 21:26:37,810 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 21:26:37,811 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 21:26:37,812 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 21:26:37,812 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/ps4.c [2019-11-06 21:26:37,885 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d139b4e14/57f9fc236af248a7a55471235b59c17f/FLAGe77cd83ab [2019-11-06 21:26:38,319 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 21:26:38,320 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/ps4.c [2019-11-06 21:26:38,325 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d139b4e14/57f9fc236af248a7a55471235b59c17f/FLAGe77cd83ab [2019-11-06 21:26:38,759 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/d139b4e14/57f9fc236af248a7a55471235b59c17f [2019-11-06 21:26:38,767 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 21:26:38,769 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 21:26:38,770 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 21:26:38,770 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 21:26:38,773 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 21:26:38,774 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:26:38" (1/1) ... [2019-11-06 21:26:38,777 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7f84318 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:26:38, skipping insertion in model container [2019-11-06 21:26:38,777 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:26:38" (1/1) ... [2019-11-06 21:26:38,784 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 21:26:38,800 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 21:26:38,962 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 21:26:38,966 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 21:26:38,985 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 21:26:38,999 INFO L192 MainTranslator]: Completed translation [2019-11-06 21:26:39,000 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:26:39 WrapperNode [2019-11-06 21:26:39,000 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 21:26:39,001 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 21:26:39,001 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 21:26:39,001 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 21:26:39,089 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:26:39" (1/1) ... [2019-11-06 21:26:39,090 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:26:39" (1/1) ... [2019-11-06 21:26:39,094 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:26:39" (1/1) ... [2019-11-06 21:26:39,095 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:26:39" (1/1) ... [2019-11-06 21:26:39,098 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:26:39" (1/1) ... [2019-11-06 21:26:39,102 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:26:39" (1/1) ... [2019-11-06 21:26:39,103 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:26:39" (1/1) ... [2019-11-06 21:26:39,105 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 21:26:39,105 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 21:26:39,106 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 21:26:39,106 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 21:26:39,107 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:26:39" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 21:26:39,161 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 21:26:39,161 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 21:26:39,162 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 21:26:39,162 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 21:26:39,162 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 21:26:39,162 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 21:26:39,162 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assume [2019-11-06 21:26:39,162 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 21:26:39,162 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 21:26:39,163 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 21:26:39,163 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 21:26:39,335 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 21:26:39,335 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-06 21:26:39,336 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:26:39 BoogieIcfgContainer [2019-11-06 21:26:39,336 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 21:26:39,344 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 21:26:39,344 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 21:26:39,352 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 21:26:39,352 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 09:26:38" (1/3) ... [2019-11-06 21:26:39,354 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d3771aa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:26:39, skipping insertion in model container [2019-11-06 21:26:39,354 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:26:39" (2/3) ... [2019-11-06 21:26:39,358 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d3771aa and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:26:39, skipping insertion in model container [2019-11-06 21:26:39,358 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:26:39" (3/3) ... [2019-11-06 21:26:39,361 INFO L109 eAbstractionObserver]: Analyzing ICFG ps4.c [2019-11-06 21:26:39,389 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 21:26:39,404 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 21:26:39,423 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 21:26:39,454 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 21:26:39,454 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 21:26:39,455 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 21:26:39,455 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 21:26:39,455 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 21:26:39,455 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 21:26:39,455 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 21:26:39,455 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 21:26:39,470 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2019-11-06 21:26:39,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-06 21:26:39,475 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:26:39,476 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:26:39,478 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:26:39,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:26:39,484 INFO L82 PathProgramCache]: Analyzing trace with hash -148746498, now seen corresponding path program 1 times [2019-11-06 21:26:39,491 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:26:39,492 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1945648289] [2019-11-06 21:26:39,492 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:26:39,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:26:39,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:26:39,587 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:26:39,588 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1945648289] [2019-11-06 21:26:39,589 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 21:26:39,589 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2019-11-06 21:26:39,590 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626574263] [2019-11-06 21:26:39,594 INFO L442 AbstractCegarLoop]: Interpolant automaton has 2 states [2019-11-06 21:26:39,594 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:26:39,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2019-11-06 21:26:39,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-06 21:26:39,606 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2019-11-06 21:26:39,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:26:39,629 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2019-11-06 21:26:39,629 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2019-11-06 21:26:39,631 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2019-11-06 21:26:39,631 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:26:39,640 INFO L225 Difference]: With dead ends: 37 [2019-11-06 21:26:39,640 INFO L226 Difference]: Without dead ends: 16 [2019-11-06 21:26:39,643 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2019-11-06 21:26:39,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2019-11-06 21:26:39,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2019-11-06 21:26:39,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2019-11-06 21:26:39,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2019-11-06 21:26:39,681 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 10 [2019-11-06 21:26:39,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:26:39,681 INFO L462 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2019-11-06 21:26:39,681 INFO L463 AbstractCegarLoop]: Interpolant automaton has 2 states. [2019-11-06 21:26:39,682 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2019-11-06 21:26:39,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2019-11-06 21:26:39,683 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:26:39,683 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:26:39,684 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:26:39,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:26:39,684 INFO L82 PathProgramCache]: Analyzing trace with hash -156194248, now seen corresponding path program 1 times [2019-11-06 21:26:39,684 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:26:39,685 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [849696367] [2019-11-06 21:26:39,685 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:26:39,692 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:26:39,692 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [124258648] [2019-11-06 21:26:39,692 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:39,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:26:39,739 INFO L256 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 21:26:39,745 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:26:39,800 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:26:39,800 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [849696367] [2019-11-06 21:26:39,800 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:26:39,801 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [124258648] [2019-11-06 21:26:39,801 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 21:26:39,801 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2019-11-06 21:26:39,801 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1068014400] [2019-11-06 21:26:39,803 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-06 21:26:39,803 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:26:39,803 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-06 21:26:39,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2019-11-06 21:26:39,804 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2019-11-06 21:26:39,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:26:39,911 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2019-11-06 21:26:39,911 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-06 21:26:39,912 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2019-11-06 21:26:39,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:26:39,913 INFO L225 Difference]: With dead ends: 27 [2019-11-06 21:26:39,913 INFO L226 Difference]: Without dead ends: 23 [2019-11-06 21:26:39,914 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2019-11-06 21:26:39,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-11-06 21:26:39,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2019-11-06 21:26:39,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2019-11-06 21:26:39,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2019-11-06 21:26:39,930 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 10 [2019-11-06 21:26:39,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:26:39,931 INFO L462 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2019-11-06 21:26:39,931 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-06 21:26:39,931 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2019-11-06 21:26:39,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-06 21:26:39,932 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:26:39,933 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:26:40,137 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:40,138 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:26:40,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:26:40,139 INFO L82 PathProgramCache]: Analyzing trace with hash 1425845280, now seen corresponding path program 1 times [2019-11-06 21:26:40,140 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:26:40,140 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70771958] [2019-11-06 21:26:40,140 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:26:40,146 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:26:40,147 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [885476971] [2019-11-06 21:26:40,147 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:40,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:26:40,184 INFO L256 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-06 21:26:40,186 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:26:40,284 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 21:26:40,285 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70771958] [2019-11-06 21:26:40,285 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:26:40,285 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [885476971] [2019-11-06 21:26:40,285 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:26:40,286 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2019-11-06 21:26:40,286 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807820172] [2019-11-06 21:26:40,287 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-06 21:26:40,287 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:26:40,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-06 21:26:40,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2019-11-06 21:26:40,288 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand 8 states. [2019-11-06 21:26:40,498 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:26:40,498 INFO L93 Difference]: Finished difference Result 34 states and 38 transitions. [2019-11-06 21:26:40,499 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 21:26:40,499 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2019-11-06 21:26:40,500 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:26:40,501 INFO L225 Difference]: With dead ends: 34 [2019-11-06 21:26:40,501 INFO L226 Difference]: Without dead ends: 31 [2019-11-06 21:26:40,502 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2019-11-06 21:26:40,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-11-06 21:26:40,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-11-06 21:26:40,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-11-06 21:26:40,512 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2019-11-06 21:26:40,512 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 17 [2019-11-06 21:26:40,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:26:40,513 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2019-11-06 21:26:40,513 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-06 21:26:40,513 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2019-11-06 21:26:40,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-06 21:26:40,515 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:26:40,515 INFO L410 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:26:40,716 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:40,716 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:26:40,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:26:40,717 INFO L82 PathProgramCache]: Analyzing trace with hash 1323071607, now seen corresponding path program 1 times [2019-11-06 21:26:40,718 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:26:40,718 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1553099645] [2019-11-06 21:26:40,719 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:26:40,724 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:26:40,724 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2081782012] [2019-11-06 21:26:40,724 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:40,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:26:40,767 WARN L254 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 29 conjunts are in the unsatisfiable core [2019-11-06 21:26:40,770 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:26:40,892 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:26:40,925 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 21:26:40,926 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1553099645] [2019-11-06 21:26:40,927 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:26:40,927 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2081782012] [2019-11-06 21:26:40,927 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:26:40,927 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2019-11-06 21:26:40,928 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507349404] [2019-11-06 21:26:40,928 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 21:26:40,928 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:26:40,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 21:26:40,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2019-11-06 21:26:40,930 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand 10 states. [2019-11-06 21:26:41,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:26:41,055 INFO L93 Difference]: Finished difference Result 37 states and 39 transitions. [2019-11-06 21:26:41,055 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-06 21:26:41,055 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 23 [2019-11-06 21:26:41,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:26:41,057 INFO L225 Difference]: With dead ends: 37 [2019-11-06 21:26:41,057 INFO L226 Difference]: Without dead ends: 30 [2019-11-06 21:26:41,057 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2019-11-06 21:26:41,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-11-06 21:26:41,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2019-11-06 21:26:41,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-11-06 21:26:41,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2019-11-06 21:26:41,064 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 23 [2019-11-06 21:26:41,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:26:41,065 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2019-11-06 21:26:41,065 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 21:26:41,065 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2019-11-06 21:26:41,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2019-11-06 21:26:41,066 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:26:41,066 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:26:41,272 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:41,272 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:26:41,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:26:41,273 INFO L82 PathProgramCache]: Analyzing trace with hash -1905380040, now seen corresponding path program 2 times [2019-11-06 21:26:41,273 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:26:41,273 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1679281484] [2019-11-06 21:26:41,273 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:26:41,278 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:26:41,278 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [403465684] [2019-11-06 21:26:41,278 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:41,306 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:26:41,307 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:26:41,307 INFO L256 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 23 conjunts are in the unsatisfiable core [2019-11-06 21:26:41,309 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:26:41,380 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 21:26:41,380 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1679281484] [2019-11-06 21:26:41,380 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:26:41,380 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [403465684] [2019-11-06 21:26:41,380 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:26:41,381 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2019-11-06 21:26:41,381 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492599037] [2019-11-06 21:26:41,381 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 21:26:41,382 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:26:41,382 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 21:26:41,382 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2019-11-06 21:26:41,382 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 9 states. [2019-11-06 21:26:41,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:26:41,523 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2019-11-06 21:26:41,523 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-06 21:26:41,524 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 24 [2019-11-06 21:26:41,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:26:41,525 INFO L225 Difference]: With dead ends: 41 [2019-11-06 21:26:41,525 INFO L226 Difference]: Without dead ends: 38 [2019-11-06 21:26:41,526 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2019-11-06 21:26:41,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-11-06 21:26:41,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2019-11-06 21:26:41,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-11-06 21:26:41,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 41 transitions. [2019-11-06 21:26:41,546 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 41 transitions. Word has length 24 [2019-11-06 21:26:41,546 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:26:41,547 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 41 transitions. [2019-11-06 21:26:41,547 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 21:26:41,548 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 41 transitions. [2019-11-06 21:26:41,548 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2019-11-06 21:26:41,550 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:26:41,550 INFO L410 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:26:41,751 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:41,751 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:26:41,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:26:41,752 INFO L82 PathProgramCache]: Analyzing trace with hash 450416527, now seen corresponding path program 2 times [2019-11-06 21:26:41,752 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:26:41,752 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1371895592] [2019-11-06 21:26:41,752 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:26:41,756 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:26:41,756 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [964427016] [2019-11-06 21:26:41,757 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 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 [2019-11-06 21:26:41,794 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:26:41,794 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:26:41,795 INFO L256 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-06 21:26:41,797 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:26:43,197 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:26:43,228 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 11 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-06 21:26:43,229 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1371895592] [2019-11-06 21:26:43,229 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:26:43,229 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [964427016] [2019-11-06 21:26:43,229 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:26:43,229 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2019-11-06 21:26:43,230 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [183761603] [2019-11-06 21:26:43,230 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 21:26:43,231 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:26:43,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 21:26:43,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2019-11-06 21:26:43,231 INFO L87 Difference]: Start difference. First operand 38 states and 41 transitions. Second operand 10 states. [2019-11-06 21:26:43,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:26:43,404 INFO L93 Difference]: Finished difference Result 44 states and 46 transitions. [2019-11-06 21:26:43,405 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 21:26:43,405 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 30 [2019-11-06 21:26:43,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:26:43,407 INFO L225 Difference]: With dead ends: 44 [2019-11-06 21:26:43,407 INFO L226 Difference]: Without dead ends: 37 [2019-11-06 21:26:43,408 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 20 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=33, Invalid=123, Unknown=0, NotChecked=0, Total=156 [2019-11-06 21:26:43,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-06 21:26:43,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2019-11-06 21:26:43,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-11-06 21:26:43,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2019-11-06 21:26:43,415 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 30 [2019-11-06 21:26:43,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:26:43,416 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2019-11-06 21:26:43,416 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 21:26:43,416 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2019-11-06 21:26:43,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-06 21:26:43,417 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:26:43,417 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:26:43,626 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:43,627 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:26:43,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:26:43,627 INFO L82 PathProgramCache]: Analyzing trace with hash 1107083552, now seen corresponding path program 3 times [2019-11-06 21:26:43,628 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:26:43,628 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [443861152] [2019-11-06 21:26:43,628 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:26:43,634 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:26:43,634 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1371933613] [2019-11-06 21:26:43,635 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:43,670 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-11-06 21:26:43,670 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:26:43,671 INFO L256 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-06 21:26:43,673 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:26:43,787 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:26:43,862 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 19 proven. 1 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2019-11-06 21:26:43,862 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [443861152] [2019-11-06 21:26:43,862 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:26:43,862 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1371933613] [2019-11-06 21:26:43,863 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:26:43,863 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2019-11-06 21:26:43,863 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1524121686] [2019-11-06 21:26:43,863 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 21:26:43,864 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:26:43,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 21:26:43,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2019-11-06 21:26:43,864 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand 7 states. [2019-11-06 21:26:44,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:26:44,012 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2019-11-06 21:26:44,013 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 21:26:44,013 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 31 [2019-11-06 21:26:44,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:26:44,015 INFO L225 Difference]: With dead ends: 43 [2019-11-06 21:26:44,015 INFO L226 Difference]: Without dead ends: 38 [2019-11-06 21:26:44,015 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2019-11-06 21:26:44,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-11-06 21:26:44,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2019-11-06 21:26:44,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-11-06 21:26:44,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2019-11-06 21:26:44,022 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 31 [2019-11-06 21:26:44,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:26:44,023 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2019-11-06 21:26:44,023 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 21:26:44,023 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2019-11-06 21:26:44,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-11-06 21:26:44,024 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:26:44,024 INFO L410 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:26:44,228 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:44,229 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:26:44,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:26:44,230 INFO L82 PathProgramCache]: Analyzing trace with hash 1589169527, now seen corresponding path program 3 times [2019-11-06 21:26:44,230 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:26:44,230 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1115998168] [2019-11-06 21:26:44,231 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:26:44,245 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:26:44,245 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1529714237] [2019-11-06 21:26:44,245 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:44,299 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-11-06 21:26:44,299 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:26:44,301 INFO L256 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 30 conjunts are in the unsatisfiable core [2019-11-06 21:26:44,303 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:26:44,410 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:26:44,447 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 28 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-06 21:26:44,447 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1115998168] [2019-11-06 21:26:44,448 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:26:44,448 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1529714237] [2019-11-06 21:26:44,448 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:26:44,448 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2019-11-06 21:26:44,448 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646042451] [2019-11-06 21:26:44,450 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-06 21:26:44,452 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:26:44,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-06 21:26:44,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=109, Unknown=0, NotChecked=0, Total=132 [2019-11-06 21:26:44,453 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 12 states. [2019-11-06 21:26:44,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:26:44,620 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2019-11-06 21:26:44,620 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-06 21:26:44,620 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 37 [2019-11-06 21:26:44,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:26:44,621 INFO L225 Difference]: With dead ends: 46 [2019-11-06 21:26:44,621 INFO L226 Difference]: Without dead ends: 41 [2019-11-06 21:26:44,622 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2019-11-06 21:26:44,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-11-06 21:26:44,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2019-11-06 21:26:44,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2019-11-06 21:26:44,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 42 transitions. [2019-11-06 21:26:44,629 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 42 transitions. Word has length 37 [2019-11-06 21:26:44,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:26:44,629 INFO L462 AbstractCegarLoop]: Abstraction has 41 states and 42 transitions. [2019-11-06 21:26:44,630 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-06 21:26:44,630 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 42 transitions. [2019-11-06 21:26:44,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-11-06 21:26:44,631 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:26:44,631 INFO L410 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:26:44,835 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:44,836 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:26:44,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:26:44,836 INFO L82 PathProgramCache]: Analyzing trace with hash 2137184911, now seen corresponding path program 4 times [2019-11-06 21:26:44,837 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:26:44,837 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [812544195] [2019-11-06 21:26:44,838 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:26:44,842 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:26:44,842 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [931711913] [2019-11-06 21:26:44,843 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:44,880 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:26:44,880 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:26:44,881 INFO L256 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 52 conjunts are in the unsatisfiable core [2019-11-06 21:26:44,887 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:26:45,041 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:26:45,073 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 13 proven. 45 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-11-06 21:26:45,073 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [812544195] [2019-11-06 21:26:45,073 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:26:45,073 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [931711913] [2019-11-06 21:26:45,074 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:26:45,074 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2019-11-06 21:26:45,074 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489244636] [2019-11-06 21:26:45,074 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-06 21:26:45,075 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:26:45,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-06 21:26:45,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2019-11-06 21:26:45,075 INFO L87 Difference]: Start difference. First operand 41 states and 42 transitions. Second operand 13 states. [2019-11-06 21:26:45,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:26:45,272 INFO L93 Difference]: Finished difference Result 53 states and 54 transitions. [2019-11-06 21:26:45,273 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 21:26:45,273 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 44 [2019-11-06 21:26:45,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:26:45,274 INFO L225 Difference]: With dead ends: 53 [2019-11-06 21:26:45,274 INFO L226 Difference]: Without dead ends: 48 [2019-11-06 21:26:45,275 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 30 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2019-11-06 21:26:45,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-11-06 21:26:45,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2019-11-06 21:26:45,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-11-06 21:26:45,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2019-11-06 21:26:45,282 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 44 [2019-11-06 21:26:45,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:26:45,283 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2019-11-06 21:26:45,283 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-06 21:26:45,283 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2019-11-06 21:26:45,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-11-06 21:26:45,284 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:26:45,284 INFO L410 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:26:45,497 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:45,498 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:26:45,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:26:45,498 INFO L82 PathProgramCache]: Analyzing trace with hash 1474060919, now seen corresponding path program 5 times [2019-11-06 21:26:45,499 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:26:45,499 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1930879478] [2019-11-06 21:26:45,499 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:26:45,504 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:26:45,505 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [142034042] [2019-11-06 21:26:45,505 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 [2019-11-06 21:26:45,565 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-11-06 21:26:45,565 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:26:45,566 INFO L256 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 36 conjunts are in the unsatisfiable core [2019-11-06 21:26:45,569 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:26:45,686 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:26:45,722 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 14 proven. 58 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-11-06 21:26:45,723 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1930879478] [2019-11-06 21:26:45,723 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:26:45,723 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [142034042] [2019-11-06 21:26:45,723 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:26:45,723 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2019-11-06 21:26:45,724 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889869256] [2019-11-06 21:26:45,724 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-06 21:26:45,724 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:26:45,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-06 21:26:45,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2019-11-06 21:26:45,725 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 13 states. [2019-11-06 21:26:46,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:26:46,001 INFO L93 Difference]: Finished difference Result 56 states and 58 transitions. [2019-11-06 21:26:46,001 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-11-06 21:26:46,001 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 51 [2019-11-06 21:26:46,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:26:46,002 INFO L225 Difference]: With dead ends: 56 [2019-11-06 21:26:46,002 INFO L226 Difference]: Without dead ends: 51 [2019-11-06 21:26:46,003 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=201, Unknown=0, NotChecked=0, Total=240 [2019-11-06 21:26:46,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2019-11-06 21:26:46,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2019-11-06 21:26:46,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2019-11-06 21:26:46,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 53 transitions. [2019-11-06 21:26:46,010 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 53 transitions. Word has length 51 [2019-11-06 21:26:46,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:26:46,011 INFO L462 AbstractCegarLoop]: Abstraction has 51 states and 53 transitions. [2019-11-06 21:26:46,011 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-06 21:26:46,011 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 53 transitions. [2019-11-06 21:26:46,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2019-11-06 21:26:46,012 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:26:46,012 INFO L410 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:26:46,216 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:46,216 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:26:46,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:26:46,217 INFO L82 PathProgramCache]: Analyzing trace with hash -1744984689, now seen corresponding path program 6 times [2019-11-06 21:26:46,217 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:26:46,218 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [187351164] [2019-11-06 21:26:46,218 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:26:46,222 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:26:46,223 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [710749780] [2019-11-06 21:26:46,223 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:46,312 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-06 21:26:46,312 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:26:46,313 INFO L256 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 42 conjunts are in the unsatisfiable core [2019-11-06 21:26:46,316 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:26:46,457 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:26:46,491 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 13 proven. 82 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-11-06 21:26:46,491 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [187351164] [2019-11-06 21:26:46,491 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:26:46,491 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [710749780] [2019-11-06 21:26:46,492 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:26:46,492 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2019-11-06 21:26:46,492 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361342464] [2019-11-06 21:26:46,493 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 21:26:46,493 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:26:46,493 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 21:26:46,493 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=181, Unknown=0, NotChecked=0, Total=210 [2019-11-06 21:26:46,493 INFO L87 Difference]: Start difference. First operand 51 states and 53 transitions. Second operand 15 states. [2019-11-06 21:26:46,779 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:26:46,780 INFO L93 Difference]: Finished difference Result 59 states and 62 transitions. [2019-11-06 21:26:46,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 21:26:46,780 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 58 [2019-11-06 21:26:46,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:26:46,782 INFO L225 Difference]: With dead ends: 59 [2019-11-06 21:26:46,782 INFO L226 Difference]: Without dead ends: 54 [2019-11-06 21:26:46,783 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=262, Unknown=0, NotChecked=0, Total=306 [2019-11-06 21:26:46,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-11-06 21:26:46,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2019-11-06 21:26:46,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2019-11-06 21:26:46,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 57 transitions. [2019-11-06 21:26:46,791 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 57 transitions. Word has length 58 [2019-11-06 21:26:46,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:26:46,792 INFO L462 AbstractCegarLoop]: Abstraction has 54 states and 57 transitions. [2019-11-06 21:26:46,792 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 21:26:46,792 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 57 transitions. [2019-11-06 21:26:46,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-11-06 21:26:46,793 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:26:46,793 INFO L410 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:26:46,997 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:46,997 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:26:46,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:26:46,998 INFO L82 PathProgramCache]: Analyzing trace with hash -862505097, now seen corresponding path program 7 times [2019-11-06 21:26:46,999 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:26:46,999 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750283449] [2019-11-06 21:26:46,999 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:26:47,004 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:26:47,005 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [266330333] [2019-11-06 21:26:47,005 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY 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 [2019-11-06 21:26:47,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:26:47,050 INFO L256 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 65 conjunts are in the unsatisfiable core [2019-11-06 21:26:47,052 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:26:47,275 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:26:47,309 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 32 proven. 104 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2019-11-06 21:26:47,310 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1750283449] [2019-11-06 21:26:47,310 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:26:47,310 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [266330333] [2019-11-06 21:26:47,310 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:26:47,310 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2019-11-06 21:26:47,311 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927485746] [2019-11-06 21:26:47,311 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-06 21:26:47,311 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:26:47,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-06 21:26:47,312 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=209, Unknown=0, NotChecked=0, Total=240 [2019-11-06 21:26:47,312 INFO L87 Difference]: Start difference. First operand 54 states and 57 transitions. Second operand 16 states. [2019-11-06 21:26:47,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:26:47,625 INFO L93 Difference]: Finished difference Result 66 states and 69 transitions. [2019-11-06 21:26:47,626 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-06 21:26:47,626 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 65 [2019-11-06 21:26:47,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:26:47,628 INFO L225 Difference]: With dead ends: 66 [2019-11-06 21:26:47,628 INFO L226 Difference]: Without dead ends: 61 [2019-11-06 21:26:47,629 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 49 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=47, Invalid=295, Unknown=0, NotChecked=0, Total=342 [2019-11-06 21:26:47,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-11-06 21:26:47,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2019-11-06 21:26:47,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-11-06 21:26:47,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2019-11-06 21:26:47,638 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 65 [2019-11-06 21:26:47,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:26:47,638 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2019-11-06 21:26:47,638 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-06 21:26:47,638 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2019-11-06 21:26:47,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2019-11-06 21:26:47,640 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:26:47,640 INFO L410 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:26:47,845 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:47,845 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:26:47,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:26:47,846 INFO L82 PathProgramCache]: Analyzing trace with hash -1738985329, now seen corresponding path program 8 times [2019-11-06 21:26:47,846 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:26:47,847 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1752364877] [2019-11-06 21:26:47,847 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:26:47,853 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:26:47,853 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [300053737] [2019-11-06 21:26:47,853 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:47,907 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:26:47,908 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:26:47,909 INFO L256 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 66 conjunts are in the unsatisfiable core [2019-11-06 21:26:47,912 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:26:48,243 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:26:48,287 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 41 proven. 109 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2019-11-06 21:26:48,288 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1752364877] [2019-11-06 21:26:48,288 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:26:48,288 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [300053737] [2019-11-06 21:26:48,288 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:26:48,288 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2019-11-06 21:26:48,288 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1717047420] [2019-11-06 21:26:48,293 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-06 21:26:48,293 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:26:48,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-06 21:26:48,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2019-11-06 21:26:48,294 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 17 states. [2019-11-06 21:26:48,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:26:48,632 INFO L93 Difference]: Finished difference Result 73 states and 76 transitions. [2019-11-06 21:26:48,633 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-06 21:26:48,633 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 72 [2019-11-06 21:26:48,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:26:48,634 INFO L225 Difference]: With dead ends: 73 [2019-11-06 21:26:48,635 INFO L226 Difference]: Without dead ends: 68 [2019-11-06 21:26:48,636 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=49, Invalid=331, Unknown=0, NotChecked=0, Total=380 [2019-11-06 21:26:48,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2019-11-06 21:26:48,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2019-11-06 21:26:48,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-11-06 21:26:48,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 71 transitions. [2019-11-06 21:26:48,645 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 71 transitions. Word has length 72 [2019-11-06 21:26:48,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:26:48,646 INFO L462 AbstractCegarLoop]: Abstraction has 68 states and 71 transitions. [2019-11-06 21:26:48,646 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-06 21:26:48,646 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 71 transitions. [2019-11-06 21:26:48,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2019-11-06 21:26:48,649 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:26:48,649 INFO L410 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:26:48,855 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:48,856 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:26:48,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:26:48,856 INFO L82 PathProgramCache]: Analyzing trace with hash 54086775, now seen corresponding path program 9 times [2019-11-06 21:26:48,857 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:26:48,857 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654265297] [2019-11-06 21:26:48,857 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:26:48,863 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:26:48,863 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1537044780] [2019-11-06 21:26:48,863 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2019-11-06 21:26:48,978 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-11-06 21:26:48,978 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:26:48,979 INFO L256 TraceCheckSpWp]: Trace formula consists of 193 conjuncts, 54 conjunts are in the unsatisfiable core [2019-11-06 21:26:48,981 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:26:49,152 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:26:49,195 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 19 proven. 163 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-11-06 21:26:49,195 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654265297] [2019-11-06 21:26:49,196 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:26:49,196 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1537044780] [2019-11-06 21:26:49,196 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:26:49,196 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2019-11-06 21:26:49,196 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2091021098] [2019-11-06 21:26:49,197 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 21:26:49,197 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:26:49,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 21:26:49,198 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=271, Unknown=0, NotChecked=0, Total=306 [2019-11-06 21:26:49,198 INFO L87 Difference]: Start difference. First operand 68 states and 71 transitions. Second operand 18 states. [2019-11-06 21:26:49,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:26:49,584 INFO L93 Difference]: Finished difference Result 76 states and 80 transitions. [2019-11-06 21:26:49,585 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 21:26:49,585 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 79 [2019-11-06 21:26:49,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:26:49,587 INFO L225 Difference]: With dead ends: 76 [2019-11-06 21:26:49,587 INFO L226 Difference]: Without dead ends: 71 [2019-11-06 21:26:49,588 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=50, Invalid=370, Unknown=0, NotChecked=0, Total=420 [2019-11-06 21:26:49,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2019-11-06 21:26:49,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 71. [2019-11-06 21:26:49,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2019-11-06 21:26:49,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 75 transitions. [2019-11-06 21:26:49,596 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 75 transitions. Word has length 79 [2019-11-06 21:26:49,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:26:49,597 INFO L462 AbstractCegarLoop]: Abstraction has 71 states and 75 transitions. [2019-11-06 21:26:49,597 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 21:26:49,597 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 75 transitions. [2019-11-06 21:26:49,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2019-11-06 21:26:49,598 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:26:49,599 INFO L410 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:26:49,802 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:49,803 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:26:49,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:26:49,803 INFO L82 PathProgramCache]: Analyzing trace with hash -2145027185, now seen corresponding path program 10 times [2019-11-06 21:26:49,804 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:26:49,804 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [738259672] [2019-11-06 21:26:49,805 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:26:49,814 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:26:49,814 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1928831173] [2019-11-06 21:26:49,814 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:49,878 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:26:49,879 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:26:49,881 INFO L256 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 78 conjunts are in the unsatisfiable core [2019-11-06 21:26:49,883 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:26:50,173 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:26:50,238 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 52 proven. 207 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2019-11-06 21:26:50,238 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [738259672] [2019-11-06 21:26:50,238 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:26:50,238 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1928831173] [2019-11-06 21:26:50,238 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:26:50,239 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2019-11-06 21:26:50,239 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1022441756] [2019-11-06 21:26:50,239 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-06 21:26:50,240 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:26:50,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-06 21:26:50,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=340, Unknown=0, NotChecked=0, Total=380 [2019-11-06 21:26:50,240 INFO L87 Difference]: Start difference. First operand 71 states and 75 transitions. Second operand 20 states. [2019-11-06 21:26:50,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:26:50,776 INFO L93 Difference]: Finished difference Result 83 states and 87 transitions. [2019-11-06 21:26:50,776 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-06 21:26:50,776 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 86 [2019-11-06 21:26:50,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:26:50,778 INFO L225 Difference]: With dead ends: 83 [2019-11-06 21:26:50,778 INFO L226 Difference]: Without dead ends: 78 [2019-11-06 21:26:50,779 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 66 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=56, Invalid=450, Unknown=0, NotChecked=0, Total=506 [2019-11-06 21:26:50,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-11-06 21:26:50,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 78. [2019-11-06 21:26:50,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2019-11-06 21:26:50,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 82 transitions. [2019-11-06 21:26:50,788 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 82 transitions. Word has length 86 [2019-11-06 21:26:50,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:26:50,789 INFO L462 AbstractCegarLoop]: Abstraction has 78 states and 82 transitions. [2019-11-06 21:26:50,789 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-06 21:26:50,789 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 82 transitions. [2019-11-06 21:26:50,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2019-11-06 21:26:50,790 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:26:50,790 INFO L410 BasicCegarLoop]: trace histogram [13, 12, 12, 12, 12, 12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:26:50,994 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:50,994 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:26:50,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:26:50,995 INFO L82 PathProgramCache]: Analyzing trace with hash -166551177, now seen corresponding path program 11 times [2019-11-06 21:26:50,995 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:26:50,995 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [45515090] [2019-11-06 21:26:50,996 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:26:51,001 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:26:51,001 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1427536618] [2019-11-06 21:26:51,001 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 [2019-11-06 21:26:51,099 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-11-06 21:26:51,099 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:26:51,101 INFO L256 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 60 conjunts are in the unsatisfiable core [2019-11-06 21:26:51,103 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:26:53,163 WARN L860 $PredicateComparison]: unable to prove that (and (= 0 (mod (let ((.cse0 (* c_main_~y~0 c_main_~y~0))) (+ (* (* (* (* c_main_~y~0 2) c_main_~y~0) c_main_~y~0) 3) (* .cse0 3) (* (* (* .cse0 c_main_~y~0) c_main_~y~0) 3))) (- 4))) (= c_main_~c~0 2) (= c_main_~y~0 2)) is different from true [2019-11-06 21:26:53,311 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:26:53,350 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 29 proven. 215 refuted. 0 times theorem prover too weak. 231 trivial. 11 not checked. [2019-11-06 21:26:53,350 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [45515090] [2019-11-06 21:26:53,351 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:26:53,351 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1427536618] [2019-11-06 21:26:53,351 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:26:53,351 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2019-11-06 21:26:53,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [448983201] [2019-11-06 21:26:53,352 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-06 21:26:53,352 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:26:53,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-06 21:26:53,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=307, Unknown=1, NotChecked=34, Total=380 [2019-11-06 21:26:53,353 INFO L87 Difference]: Start difference. First operand 78 states and 82 transitions. Second operand 20 states. [2019-11-06 21:26:53,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:26:53,778 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2019-11-06 21:26:53,779 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-06 21:26:53,779 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 93 [2019-11-06 21:26:53,779 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:26:53,780 INFO L225 Difference]: With dead ends: 86 [2019-11-06 21:26:53,780 INFO L226 Difference]: Without dead ends: 81 [2019-11-06 21:26:53,781 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=53, Invalid=412, Unknown=1, NotChecked=40, Total=506 [2019-11-06 21:26:53,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2019-11-06 21:26:53,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2019-11-06 21:26:53,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2019-11-06 21:26:53,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 86 transitions. [2019-11-06 21:26:53,790 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 86 transitions. Word has length 93 [2019-11-06 21:26:53,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:26:53,791 INFO L462 AbstractCegarLoop]: Abstraction has 81 states and 86 transitions. [2019-11-06 21:26:53,791 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-06 21:26:53,791 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 86 transitions. [2019-11-06 21:26:53,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2019-11-06 21:26:53,793 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:26:53,793 INFO L410 BasicCegarLoop]: trace histogram [14, 13, 13, 13, 13, 13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:26:53,996 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:53,997 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:26:53,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:26:53,997 INFO L82 PathProgramCache]: Analyzing trace with hash 454198927, now seen corresponding path program 12 times [2019-11-06 21:26:53,998 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:26:53,998 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2031970091] [2019-11-06 21:26:53,998 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:26:54,003 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:26:54,003 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [885190276] [2019-11-06 21:26:54,003 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:54,117 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-11-06 21:26:54,117 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:26:54,119 INFO L256 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 66 conjunts are in the unsatisfiable core [2019-11-06 21:26:54,122 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:26:54,372 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:26:54,427 INFO L134 CoverageAnalysis]: Checked inductivity of 572 backedges. 25 proven. 271 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2019-11-06 21:26:54,428 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2031970091] [2019-11-06 21:26:54,428 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:26:54,428 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [885190276] [2019-11-06 21:26:54,428 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:26:54,428 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2019-11-06 21:26:54,429 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562108620] [2019-11-06 21:26:54,429 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-06 21:26:54,429 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:26:54,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-06 21:26:54,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=379, Unknown=0, NotChecked=0, Total=420 [2019-11-06 21:26:54,430 INFO L87 Difference]: Start difference. First operand 81 states and 86 transitions. Second operand 21 states. [2019-11-06 21:26:54,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:26:54,912 INFO L93 Difference]: Finished difference Result 89 states and 95 transitions. [2019-11-06 21:26:54,918 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-06 21:26:54,918 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 100 [2019-11-06 21:26:54,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:26:54,919 INFO L225 Difference]: With dead ends: 89 [2019-11-06 21:26:54,920 INFO L226 Difference]: Without dead ends: 84 [2019-11-06 21:26:54,920 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=56, Invalid=496, Unknown=0, NotChecked=0, Total=552 [2019-11-06 21:26:54,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-11-06 21:26:54,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2019-11-06 21:26:54,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2019-11-06 21:26:54,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 90 transitions. [2019-11-06 21:26:54,940 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 90 transitions. Word has length 100 [2019-11-06 21:26:54,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:26:54,941 INFO L462 AbstractCegarLoop]: Abstraction has 84 states and 90 transitions. [2019-11-06 21:26:54,941 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-06 21:26:54,941 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 90 transitions. [2019-11-06 21:26:54,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2019-11-06 21:26:54,943 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:26:54,943 INFO L410 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:26:55,147 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:55,147 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:26:55,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:26:55,148 INFO L82 PathProgramCache]: Analyzing trace with hash 1400059511, now seen corresponding path program 13 times [2019-11-06 21:26:55,148 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:26:55,148 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1108476477] [2019-11-06 21:26:55,149 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:26:55,162 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:26:55,162 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1300212324] [2019-11-06 21:26:55,163 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY 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 [2019-11-06 21:26:55,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:26:55,235 INFO L256 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 101 conjunts are in the unsatisfiable core [2019-11-06 21:26:55,238 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:26:55,672 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:26:55,735 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 62 proven. 311 refuted. 0 times theorem prover too weak. 292 trivial. 0 not checked. [2019-11-06 21:26:55,736 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1108476477] [2019-11-06 21:26:55,736 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:26:55,736 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1300212324] [2019-11-06 21:26:55,736 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:26:55,736 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2019-11-06 21:26:55,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993606247] [2019-11-06 21:26:55,737 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-06 21:26:55,737 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:26:55,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-06 21:26:55,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=419, Unknown=0, NotChecked=0, Total=462 [2019-11-06 21:26:55,738 INFO L87 Difference]: Start difference. First operand 84 states and 90 transitions. Second operand 22 states. [2019-11-06 21:26:56,365 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:26:56,366 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2019-11-06 21:26:56,366 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-06 21:26:56,366 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 107 [2019-11-06 21:26:56,367 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:26:56,368 INFO L225 Difference]: With dead ends: 96 [2019-11-06 21:26:56,368 INFO L226 Difference]: Without dead ends: 91 [2019-11-06 21:26:56,369 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 85 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=59, Invalid=541, Unknown=0, NotChecked=0, Total=600 [2019-11-06 21:26:56,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2019-11-06 21:26:56,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2019-11-06 21:26:56,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2019-11-06 21:26:56,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 97 transitions. [2019-11-06 21:26:56,379 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 97 transitions. Word has length 107 [2019-11-06 21:26:56,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:26:56,379 INFO L462 AbstractCegarLoop]: Abstraction has 91 states and 97 transitions. [2019-11-06 21:26:56,379 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-06 21:26:56,380 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 97 transitions. [2019-11-06 21:26:56,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2019-11-06 21:26:56,381 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:26:56,381 INFO L410 BasicCegarLoop]: trace histogram [16, 15, 15, 15, 15, 15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:26:56,584 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:56,584 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:26:56,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:26:56,585 INFO L82 PathProgramCache]: Analyzing trace with hash 13652367, now seen corresponding path program 14 times [2019-11-06 21:26:56,586 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:26:56,586 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733554154] [2019-11-06 21:26:56,586 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:26:56,591 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:26:56,591 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1698048337] [2019-11-06 21:26:56,592 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:56,651 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:26:56,651 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:26:56,653 INFO L256 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 102 conjunts are in the unsatisfiable core [2019-11-06 21:26:56,655 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:26:57,065 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:26:57,141 INFO L134 CoverageAnalysis]: Checked inductivity of 765 backedges. 71 proven. 316 refuted. 0 times theorem prover too weak. 378 trivial. 0 not checked. [2019-11-06 21:26:57,141 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733554154] [2019-11-06 21:26:57,141 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:26:57,141 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1698048337] [2019-11-06 21:26:57,141 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:26:57,142 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2019-11-06 21:26:57,142 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729867222] [2019-11-06 21:26:57,142 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-06 21:26:57,142 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:26:57,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-06 21:26:57,143 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=461, Unknown=0, NotChecked=0, Total=506 [2019-11-06 21:26:57,143 INFO L87 Difference]: Start difference. First operand 91 states and 97 transitions. Second operand 23 states. [2019-11-06 21:26:57,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:26:57,871 INFO L93 Difference]: Finished difference Result 103 states and 109 transitions. [2019-11-06 21:26:57,872 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-06 21:26:57,872 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 114 [2019-11-06 21:26:57,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:26:57,874 INFO L225 Difference]: With dead ends: 103 [2019-11-06 21:26:57,874 INFO L226 Difference]: Without dead ends: 98 [2019-11-06 21:26:57,875 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=589, Unknown=0, NotChecked=0, Total=650 [2019-11-06 21:26:57,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2019-11-06 21:26:57,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2019-11-06 21:26:57,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2019-11-06 21:26:57,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 104 transitions. [2019-11-06 21:26:57,884 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 104 transitions. Word has length 114 [2019-11-06 21:26:57,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:26:57,885 INFO L462 AbstractCegarLoop]: Abstraction has 98 states and 104 transitions. [2019-11-06 21:26:57,885 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-06 21:26:57,885 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 104 transitions. [2019-11-06 21:26:57,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2019-11-06 21:26:57,886 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:26:57,886 INFO L410 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:26:58,096 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:58,096 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:26:58,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:26:58,097 INFO L82 PathProgramCache]: Analyzing trace with hash 2108361591, now seen corresponding path program 15 times [2019-11-06 21:26:58,098 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:26:58,098 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [315764958] [2019-11-06 21:26:58,098 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:26:58,102 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:26:58,103 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1328288771] [2019-11-06 21:26:58,103 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 [2019-11-06 21:26:58,281 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-11-06 21:26:58,281 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:26:58,283 INFO L256 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 78 conjunts are in the unsatisfiable core [2019-11-06 21:26:58,287 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:26:58,568 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:26:58,633 INFO L134 CoverageAnalysis]: Checked inductivity of 872 backedges. 31 proven. 406 refuted. 0 times theorem prover too weak. 435 trivial. 0 not checked. [2019-11-06 21:26:58,634 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [315764958] [2019-11-06 21:26:58,634 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:26:58,634 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1328288771] [2019-11-06 21:26:58,634 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:26:58,634 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2019-11-06 21:26:58,634 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744197554] [2019-11-06 21:26:58,635 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-06 21:26:58,635 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:26:58,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-06 21:26:58,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=505, Unknown=0, NotChecked=0, Total=552 [2019-11-06 21:26:58,636 INFO L87 Difference]: Start difference. First operand 98 states and 104 transitions. Second operand 24 states. [2019-11-06 21:26:59,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:26:59,353 INFO L93 Difference]: Finished difference Result 106 states and 113 transitions. [2019-11-06 21:26:59,354 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-11-06 21:26:59,354 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 121 [2019-11-06 21:26:59,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:26:59,356 INFO L225 Difference]: With dead ends: 106 [2019-11-06 21:26:59,356 INFO L226 Difference]: Without dead ends: 101 [2019-11-06 21:26:59,357 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=62, Invalid=640, Unknown=0, NotChecked=0, Total=702 [2019-11-06 21:26:59,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2019-11-06 21:26:59,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2019-11-06 21:26:59,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2019-11-06 21:26:59,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 108 transitions. [2019-11-06 21:26:59,365 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 108 transitions. Word has length 121 [2019-11-06 21:26:59,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:26:59,366 INFO L462 AbstractCegarLoop]: Abstraction has 101 states and 108 transitions. [2019-11-06 21:26:59,366 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-06 21:26:59,366 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 108 transitions. [2019-11-06 21:26:59,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2019-11-06 21:26:59,368 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:26:59,368 INFO L410 BasicCegarLoop]: trace histogram [18, 17, 17, 17, 17, 17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:26:59,573 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:59,573 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:26:59,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:26:59,574 INFO L82 PathProgramCache]: Analyzing trace with hash -1794188145, now seen corresponding path program 16 times [2019-11-06 21:26:59,574 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:26:59,574 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789764416] [2019-11-06 21:26:59,575 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:26:59,580 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:26:59,580 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [702539004] [2019-11-06 21:26:59,581 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:26:59,666 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:26:59,667 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:26:59,668 INFO L256 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 110 conjunts are in the unsatisfiable core [2019-11-06 21:26:59,672 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:27:01,705 WARN L860 $PredicateComparison]: unable to prove that (and (= c_main_~y~0 0) (= 0 (mod (let ((.cse0 (* c_main_~y~0 c_main_~y~0))) (+ (* (* (* (* c_main_~y~0 2) c_main_~y~0) c_main_~y~0) 3) (* .cse0 3) (* (* (* .cse0 c_main_~y~0) c_main_~y~0) 3))) (- 4))) (= c_main_~c~0 0)) is different from true [2019-11-06 21:27:07,173 WARN L191 SmtUtils]: Spent 2.01 s on a formula simplification. DAG size of input: 26 DAG size of output: 6 [2019-11-06 21:27:07,667 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:27:07,754 INFO L134 CoverageAnalysis]: Checked inductivity of 986 backedges. 88 proven. 464 refuted. 0 times theorem prover too weak. 418 trivial. 16 not checked. [2019-11-06 21:27:07,754 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789764416] [2019-11-06 21:27:07,754 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:27:07,755 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [702539004] [2019-11-06 21:27:07,755 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:27:07,755 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2019-11-06 21:27:07,755 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1336477355] [2019-11-06 21:27:07,756 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-06 21:27:07,756 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:27:07,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-06 21:27:07,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=598, Unknown=2, NotChecked=48, Total=702 [2019-11-06 21:27:07,757 INFO L87 Difference]: Start difference. First operand 101 states and 108 transitions. Second operand 27 states. [2019-11-06 21:27:08,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:27:08,601 INFO L93 Difference]: Finished difference Result 117 states and 123 transitions. [2019-11-06 21:27:08,601 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-11-06 21:27:08,601 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 128 [2019-11-06 21:27:08,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:27:08,603 INFO L225 Difference]: With dead ends: 117 [2019-11-06 21:27:08,603 INFO L226 Difference]: Without dead ends: 112 [2019-11-06 21:27:08,610 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=70, Invalid=744, Unknown=2, NotChecked=54, Total=870 [2019-11-06 21:27:08,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2019-11-06 21:27:08,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2019-11-06 21:27:08,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2019-11-06 21:27:08,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 118 transitions. [2019-11-06 21:27:08,628 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 118 transitions. Word has length 128 [2019-11-06 21:27:08,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:27:08,629 INFO L462 AbstractCegarLoop]: Abstraction has 112 states and 118 transitions. [2019-11-06 21:27:08,629 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-06 21:27:08,629 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 118 transitions. [2019-11-06 21:27:08,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2019-11-06 21:27:08,632 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:27:08,632 INFO L410 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:27:08,837 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:27:08,838 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:27:08,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:27:08,838 INFO L82 PathProgramCache]: Analyzing trace with hash -1962270601, now seen corresponding path program 17 times [2019-11-06 21:27:08,839 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:27:08,839 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1311181157] [2019-11-06 21:27:08,839 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:27:08,851 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:27:08,852 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1950721921] [2019-11-06 21:27:08,852 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 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 [2019-11-06 21:27:09,467 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2019-11-06 21:27:09,468 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:27:09,470 INFO L256 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 84 conjunts are in the unsatisfiable core [2019-11-06 21:27:09,473 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:27:09,774 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:27:09,823 INFO L134 CoverageAnalysis]: Checked inductivity of 1107 backedges. 41 proven. 505 refuted. 0 times theorem prover too weak. 561 trivial. 0 not checked. [2019-11-06 21:27:09,824 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1311181157] [2019-11-06 21:27:09,824 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:27:09,824 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1950721921] [2019-11-06 21:27:09,824 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:27:09,824 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2019-11-06 21:27:09,824 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433402499] [2019-11-06 21:27:09,824 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-06 21:27:09,825 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:27:09,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-06 21:27:09,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2019-11-06 21:27:09,825 INFO L87 Difference]: Start difference. First operand 112 states and 118 transitions. Second operand 25 states. [2019-11-06 21:27:10,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:27:10,559 INFO L93 Difference]: Finished difference Result 120 states and 127 transitions. [2019-11-06 21:27:10,562 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-11-06 21:27:10,562 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 135 [2019-11-06 21:27:10,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:27:10,564 INFO L225 Difference]: With dead ends: 120 [2019-11-06 21:27:10,564 INFO L226 Difference]: Without dead ends: 115 [2019-11-06 21:27:10,565 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 110 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=693, Unknown=0, NotChecked=0, Total=756 [2019-11-06 21:27:10,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2019-11-06 21:27:10,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 115. [2019-11-06 21:27:10,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2019-11-06 21:27:10,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 122 transitions. [2019-11-06 21:27:10,573 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 122 transitions. Word has length 135 [2019-11-06 21:27:10,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:27:10,573 INFO L462 AbstractCegarLoop]: Abstraction has 115 states and 122 transitions. [2019-11-06 21:27:10,573 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-06 21:27:10,573 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 122 transitions. [2019-11-06 21:27:10,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2019-11-06 21:27:10,574 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:27:10,575 INFO L410 BasicCegarLoop]: trace histogram [20, 19, 19, 19, 19, 19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:27:10,775 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:27:10,776 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:27:10,776 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:27:10,776 INFO L82 PathProgramCache]: Analyzing trace with hash 125708175, now seen corresponding path program 18 times [2019-11-06 21:27:10,777 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:27:10,777 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1681947411] [2019-11-06 21:27:10,777 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:27:10,783 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:27:10,783 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2050490336] [2019-11-06 21:27:10,783 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:27:10,995 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-11-06 21:27:10,995 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:27:10,997 INFO L256 TraceCheckSpWp]: Trace formula consists of 346 conjuncts, 90 conjunts are in the unsatisfiable core [2019-11-06 21:27:10,999 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:27:11,327 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:27:11,382 INFO L134 CoverageAnalysis]: Checked inductivity of 1235 backedges. 37 proven. 568 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2019-11-06 21:27:11,382 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1681947411] [2019-11-06 21:27:11,382 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:27:11,382 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2050490336] [2019-11-06 21:27:11,382 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:27:11,382 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2019-11-06 21:27:11,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [689754933] [2019-11-06 21:27:11,383 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-06 21:27:11,383 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:27:11,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-06 21:27:11,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=649, Unknown=0, NotChecked=0, Total=702 [2019-11-06 21:27:11,383 INFO L87 Difference]: Start difference. First operand 115 states and 122 transitions. Second operand 27 states. [2019-11-06 21:27:12,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:27:12,144 INFO L93 Difference]: Finished difference Result 123 states and 131 transitions. [2019-11-06 21:27:12,145 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-11-06 21:27:12,145 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 142 [2019-11-06 21:27:12,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:27:12,146 INFO L225 Difference]: With dead ends: 123 [2019-11-06 21:27:12,146 INFO L226 Difference]: Without dead ends: 118 [2019-11-06 21:27:12,147 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=68, Invalid=802, Unknown=0, NotChecked=0, Total=870 [2019-11-06 21:27:12,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2019-11-06 21:27:12,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2019-11-06 21:27:12,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2019-11-06 21:27:12,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 126 transitions. [2019-11-06 21:27:12,160 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 126 transitions. Word has length 142 [2019-11-06 21:27:12,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:27:12,160 INFO L462 AbstractCegarLoop]: Abstraction has 118 states and 126 transitions. [2019-11-06 21:27:12,160 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-06 21:27:12,160 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 126 transitions. [2019-11-06 21:27:12,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2019-11-06 21:27:12,162 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:27:12,162 INFO L410 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:27:12,366 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:27:12,367 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:27:12,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:27:12,367 INFO L82 PathProgramCache]: Analyzing trace with hash 1172338039, now seen corresponding path program 19 times [2019-11-06 21:27:12,368 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:27:12,368 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [782141576] [2019-11-06 21:27:12,368 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:27:12,373 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:27:12,374 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [188126688] [2019-11-06 21:27:12,374 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY 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) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:27:12,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 21:27:12,484 INFO L256 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 137 conjunts are in the unsatisfiable core [2019-11-06 21:27:12,487 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:27:13,164 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:27:13,249 INFO L134 CoverageAnalysis]: Checked inductivity of 1370 backedges. 92 proven. 626 refuted. 0 times theorem prover too weak. 652 trivial. 0 not checked. [2019-11-06 21:27:13,249 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [782141576] [2019-11-06 21:27:13,249 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:27:13,249 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [188126688] [2019-11-06 21:27:13,250 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:27:13,250 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2019-11-06 21:27:13,250 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964971682] [2019-11-06 21:27:13,250 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-11-06 21:27:13,250 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:27:13,250 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-11-06 21:27:13,251 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=701, Unknown=0, NotChecked=0, Total=756 [2019-11-06 21:27:13,251 INFO L87 Difference]: Start difference. First operand 118 states and 126 transitions. Second operand 28 states. [2019-11-06 21:27:14,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:27:14,354 INFO L93 Difference]: Finished difference Result 130 states and 138 transitions. [2019-11-06 21:27:14,354 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-11-06 21:27:14,355 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 149 [2019-11-06 21:27:14,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:27:14,357 INFO L225 Difference]: With dead ends: 130 [2019-11-06 21:27:14,357 INFO L226 Difference]: Without dead ends: 125 [2019-11-06 21:27:14,358 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 121 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=71, Invalid=859, Unknown=0, NotChecked=0, Total=930 [2019-11-06 21:27:14,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2019-11-06 21:27:14,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2019-11-06 21:27:14,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2019-11-06 21:27:14,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 133 transitions. [2019-11-06 21:27:14,367 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 133 transitions. Word has length 149 [2019-11-06 21:27:14,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:27:14,368 INFO L462 AbstractCegarLoop]: Abstraction has 125 states and 133 transitions. [2019-11-06 21:27:14,368 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-11-06 21:27:14,368 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 133 transitions. [2019-11-06 21:27:14,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2019-11-06 21:27:14,369 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:27:14,369 INFO L410 BasicCegarLoop]: trace histogram [22, 21, 21, 21, 21, 21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:27:14,573 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:27:14,573 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:27:14,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:27:14,574 INFO L82 PathProgramCache]: Analyzing trace with hash 1406022287, now seen corresponding path program 20 times [2019-11-06 21:27:14,574 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:27:14,574 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1048883133] [2019-11-06 21:27:14,575 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:27:14,580 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:27:14,581 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1880979065] [2019-11-06 21:27:14,581 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:27:14,666 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 21:27:14,666 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:27:14,669 INFO L256 TraceCheckSpWp]: Trace formula consists of 380 conjuncts, 138 conjunts are in the unsatisfiable core [2019-11-06 21:27:14,673 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:27:15,281 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:27:15,386 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 101 proven. 631 refuted. 0 times theorem prover too weak. 780 trivial. 0 not checked. [2019-11-06 21:27:15,387 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1048883133] [2019-11-06 21:27:15,387 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:27:15,387 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1880979065] [2019-11-06 21:27:15,387 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:27:15,387 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2019-11-06 21:27:15,387 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442507492] [2019-11-06 21:27:15,388 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-11-06 21:27:15,388 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:27:15,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-11-06 21:27:15,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=755, Unknown=0, NotChecked=0, Total=812 [2019-11-06 21:27:15,389 INFO L87 Difference]: Start difference. First operand 125 states and 133 transitions. Second operand 29 states. [2019-11-06 21:27:16,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:27:16,551 INFO L93 Difference]: Finished difference Result 137 states and 145 transitions. [2019-11-06 21:27:16,552 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-11-06 21:27:16,552 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 156 [2019-11-06 21:27:16,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:27:16,554 INFO L225 Difference]: With dead ends: 137 [2019-11-06 21:27:16,554 INFO L226 Difference]: Without dead ends: 132 [2019-11-06 21:27:16,555 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=73, Invalid=919, Unknown=0, NotChecked=0, Total=992 [2019-11-06 21:27:16,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2019-11-06 21:27:16,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2019-11-06 21:27:16,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 132 states. [2019-11-06 21:27:16,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 140 transitions. [2019-11-06 21:27:16,565 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 140 transitions. Word has length 156 [2019-11-06 21:27:16,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:27:16,565 INFO L462 AbstractCegarLoop]: Abstraction has 132 states and 140 transitions. [2019-11-06 21:27:16,565 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-11-06 21:27:16,566 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 140 transitions. [2019-11-06 21:27:16,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2019-11-06 21:27:16,567 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:27:16,567 INFO L410 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:27:16,770 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:27:16,770 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:27:16,771 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:27:16,771 INFO L82 PathProgramCache]: Analyzing trace with hash 746457719, now seen corresponding path program 21 times [2019-11-06 21:27:16,771 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:27:16,772 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948709364] [2019-11-06 21:27:16,772 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:27:16,778 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:27:16,778 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [253739824] [2019-11-06 21:27:16,778 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:27:17,671 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2019-11-06 21:27:17,671 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:27:17,673 INFO L256 TraceCheckSpWp]: Trace formula consists of 397 conjuncts, 102 conjunts are in the unsatisfiable core [2019-11-06 21:27:17,676 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:27:18,095 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:27:18,159 INFO L134 CoverageAnalysis]: Checked inductivity of 1661 backedges. 43 proven. 757 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2019-11-06 21:27:18,159 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1948709364] [2019-11-06 21:27:18,159 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:27:18,159 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [253739824] [2019-11-06 21:27:18,159 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:27:18,160 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2019-11-06 21:27:18,160 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959204926] [2019-11-06 21:27:18,160 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-11-06 21:27:18,160 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:27:18,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-11-06 21:27:18,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=811, Unknown=0, NotChecked=0, Total=870 [2019-11-06 21:27:18,161 INFO L87 Difference]: Start difference. First operand 132 states and 140 transitions. Second operand 30 states. [2019-11-06 21:27:19,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:27:19,146 INFO L93 Difference]: Finished difference Result 140 states and 149 transitions. [2019-11-06 21:27:19,148 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-11-06 21:27:19,148 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 163 [2019-11-06 21:27:19,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:27:19,149 INFO L225 Difference]: With dead ends: 140 [2019-11-06 21:27:19,149 INFO L226 Difference]: Without dead ends: 135 [2019-11-06 21:27:19,150 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=74, Invalid=982, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 21:27:19,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2019-11-06 21:27:19,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 135. [2019-11-06 21:27:19,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2019-11-06 21:27:19,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 144 transitions. [2019-11-06 21:27:19,160 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 144 transitions. Word has length 163 [2019-11-06 21:27:19,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:27:19,160 INFO L462 AbstractCegarLoop]: Abstraction has 135 states and 144 transitions. [2019-11-06 21:27:19,161 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-11-06 21:27:19,161 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 144 transitions. [2019-11-06 21:27:19,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2019-11-06 21:27:19,162 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:27:19,162 INFO L410 BasicCegarLoop]: trace histogram [24, 23, 23, 23, 23, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:27:19,366 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:27:19,366 INFO L410 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:27:19,366 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:27:19,366 INFO L82 PathProgramCache]: Analyzing trace with hash 1101987215, now seen corresponding path program 22 times [2019-11-06 21:27:19,367 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:27:19,367 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [41233283] [2019-11-06 21:27:19,367 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:27:19,373 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:27:19,373 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [34744285] [2019-11-06 21:27:19,373 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:27:19,558 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 21:27:19,558 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:27:19,561 INFO L256 TraceCheckSpWp]: Trace formula consists of 414 conjuncts, 104 conjunts are in the unsatisfiable core [2019-11-06 21:27:19,565 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:27:19,969 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:27:20,038 INFO L134 CoverageAnalysis]: Checked inductivity of 1817 backedges. 45 proven. 826 refuted. 0 times theorem prover too weak. 946 trivial. 0 not checked. [2019-11-06 21:27:20,038 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [41233283] [2019-11-06 21:27:20,039 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:27:20,039 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [34744285] [2019-11-06 21:27:20,039 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:27:20,039 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2019-11-06 21:27:20,039 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837473651] [2019-11-06 21:27:20,040 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-11-06 21:27:20,040 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:27:20,040 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-11-06 21:27:20,040 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=812, Unknown=0, NotChecked=0, Total=870 [2019-11-06 21:27:20,041 INFO L87 Difference]: Start difference. First operand 135 states and 144 transitions. Second operand 30 states. [2019-11-06 21:27:21,119 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:27:21,119 INFO L93 Difference]: Finished difference Result 143 states and 153 transitions. [2019-11-06 21:27:21,119 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-11-06 21:27:21,120 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 170 [2019-11-06 21:27:21,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:27:21,121 INFO L225 Difference]: With dead ends: 143 [2019-11-06 21:27:21,122 INFO L226 Difference]: Without dead ends: 138 [2019-11-06 21:27:21,123 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 140 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=73, Invalid=983, Unknown=0, NotChecked=0, Total=1056 [2019-11-06 21:27:21,123 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2019-11-06 21:27:21,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 138. [2019-11-06 21:27:21,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2019-11-06 21:27:21,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 148 transitions. [2019-11-06 21:27:21,144 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 148 transitions. Word has length 170 [2019-11-06 21:27:21,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:27:21,144 INFO L462 AbstractCegarLoop]: Abstraction has 138 states and 148 transitions. [2019-11-06 21:27:21,144 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-11-06 21:27:21,144 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 148 transitions. [2019-11-06 21:27:21,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2019-11-06 21:27:21,146 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:27:21,146 INFO L410 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:27:21,350 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:27:21,350 INFO L410 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:27:21,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:27:21,351 INFO L82 PathProgramCache]: Analyzing trace with hash 1899159415, now seen corresponding path program 23 times [2019-11-06 21:27:21,351 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:27:21,351 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1678910860] [2019-11-06 21:27:21,351 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:27:21,357 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:27:21,357 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1593376734] [2019-11-06 21:27:21,357 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:27:21,861 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2019-11-06 21:27:21,861 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:27:21,863 INFO L256 TraceCheckSpWp]: Trace formula consists of 431 conjuncts, 108 conjunts are in the unsatisfiable core [2019-11-06 21:27:21,875 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 21:27:24,229 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 21:27:24,296 INFO L134 CoverageAnalysis]: Checked inductivity of 1980 backedges. 56 proven. 889 refuted. 0 times theorem prover too weak. 1035 trivial. 0 not checked. [2019-11-06 21:27:24,297 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1678910860] [2019-11-06 21:27:24,297 INFO L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2019-11-06 21:27:24,297 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1593376734] [2019-11-06 21:27:24,297 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2019-11-06 21:27:24,297 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2019-11-06 21:27:24,297 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [46218123] [2019-11-06 21:27:24,298 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-11-06 21:27:24,298 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 21:27:24,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-11-06 21:27:24,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=870, Unknown=0, NotChecked=0, Total=930 [2019-11-06 21:27:24,299 INFO L87 Difference]: Start difference. First operand 138 states and 148 transitions. Second operand 31 states. [2019-11-06 21:27:25,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 21:27:25,491 INFO L93 Difference]: Finished difference Result 146 states and 157 transitions. [2019-11-06 21:27:25,492 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-11-06 21:27:25,492 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 177 [2019-11-06 21:27:25,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 21:27:25,494 INFO L225 Difference]: With dead ends: 146 [2019-11-06 21:27:25,494 INFO L226 Difference]: Without dead ends: 141 [2019-11-06 21:27:25,495 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 146 SyntacticMatches, 1 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=75, Invalid=1047, Unknown=0, NotChecked=0, Total=1122 [2019-11-06 21:27:25,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2019-11-06 21:27:25,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 141. [2019-11-06 21:27:25,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2019-11-06 21:27:25,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 152 transitions. [2019-11-06 21:27:25,505 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 152 transitions. Word has length 177 [2019-11-06 21:27:25,506 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 21:27:25,506 INFO L462 AbstractCegarLoop]: Abstraction has 141 states and 152 transitions. [2019-11-06 21:27:25,506 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-11-06 21:27:25,506 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 152 transitions. [2019-11-06 21:27:25,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2019-11-06 21:27:25,507 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 21:27:25,508 INFO L410 BasicCegarLoop]: trace histogram [26, 25, 25, 25, 25, 25, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 21:27:25,712 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:27:25,712 INFO L410 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 21:27:25,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 21:27:25,712 INFO L82 PathProgramCache]: Analyzing trace with hash 1691388047, now seen corresponding path program 24 times [2019-11-06 21:27:25,712 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 21:27:25,712 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1645704863] [2019-11-06 21:27:25,713 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 21:27:25,718 ERROR L268 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2019-11-06 21:27:25,719 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1392282286] [2019-11-06 21:27:25,719 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 21:27:26,397 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2019-11-06 21:27:26,397 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 21:27:26,400 INFO L256 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 114 conjunts are in the unsatisfiable core [2019-11-06 21:27:26,403 INFO L279 TraceCheckSpWp]: Computing forward predicates...