/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/eca-rers2012/Problem14_label09.c -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 19:12:35,814 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 19:12:35,817 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 19:12:35,835 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2019-11-06 19:12:35,878 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 19:12:35,879 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 19:12:35,881 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 19:12:35,885 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 19:12:35,898 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 19:12:35,898 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 19:12:35,900 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 19:12:35,900 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 19:12:35,900 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 19:12:35,900 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 19:12:35,901 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 19:12:35,901 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 19:12:35,901 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 19:12:35,901 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 19:12:35,901 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 19:12:35,901 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 19:12:35,902 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 19:12:35,902 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 19:12:35,902 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 19:12:35,902 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 19:12:35,902 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 19:12:35,903 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 19:12:35,903 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 19:12:35,903 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 19:12:35,903 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 19:12:35,903 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 19:12:35,904 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 19:12:35,904 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 19:12:35,904 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 19:12:35,904 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 19:12:35,904 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 19:12:35,905 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 19:12:35,905 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 19:12:36,161 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 19:12:36,174 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 19:12:36,177 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 19:12:36,178 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 19:12:36,179 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 19:12:36,179 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/eca-rers2012/Problem14_label09.c [2019-11-06 19:12:36,241 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7a89c2718/2c9e69140b2c4dd28a6ca39a7f4f101e/FLAGc34f9a208 [2019-11-06 19:12:36,821 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 19:12:36,822 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/eca-rers2012/Problem14_label09.c [2019-11-06 19:12:36,838 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7a89c2718/2c9e69140b2c4dd28a6ca39a7f4f101e/FLAGc34f9a208 [2019-11-06 19:12:37,038 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7a89c2718/2c9e69140b2c4dd28a6ca39a7f4f101e [2019-11-06 19:12:37,045 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 19:12:37,047 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 19:12:37,048 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 19:12:37,048 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 19:12:37,052 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 19:12:37,053 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 07:12:37" (1/1) ... [2019-11-06 19:12:37,056 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@498fa5e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 07:12:37, skipping insertion in model container [2019-11-06 19:12:37,056 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 07:12:37" (1/1) ... [2019-11-06 19:12:37,063 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 19:12:37,131 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 19:12:37,708 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 19:12:37,713 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 19:12:37,949 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 19:12:37,975 INFO L192 MainTranslator]: Completed translation [2019-11-06 19:12:37,976 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 07:12:37 WrapperNode [2019-11-06 19:12:37,976 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 19:12:37,978 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 19:12:37,978 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 19:12:37,978 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 19:12:37,997 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 07:12:37" (1/1) ... [2019-11-06 19:12:37,998 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 07:12:37" (1/1) ... [2019-11-06 19:12:38,020 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 07:12:37" (1/1) ... [2019-11-06 19:12:38,020 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 07:12:37" (1/1) ... [2019-11-06 19:12:38,068 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 07:12:37" (1/1) ... [2019-11-06 19:12:38,085 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 07:12:37" (1/1) ... [2019-11-06 19:12:38,093 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 07:12:37" (1/1) ... [2019-11-06 19:12:38,106 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 19:12:38,107 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 19:12:38,107 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 19:12:38,108 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 19:12:38,109 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 07:12:37" (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 19:12:38,199 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 19:12:38,199 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 19:12:38,199 INFO L138 BoogieDeclarations]: Found implementation of procedure calculate_output [2019-11-06 19:12:38,199 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 19:12:38,200 INFO L130 BoogieDeclarations]: Found specification of procedure calculate_output [2019-11-06 19:12:38,200 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 19:12:38,200 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-11-06 19:12:38,200 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2019-11-06 19:12:38,200 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 19:12:38,201 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 19:12:38,201 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 19:12:39,868 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 19:12:39,868 INFO L284 CfgBuilder]: Removed 1 assume(true) statements. [2019-11-06 19:12:39,873 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 07:12:39 BoogieIcfgContainer [2019-11-06 19:12:39,873 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 19:12:39,875 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 19:12:39,875 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 19:12:39,879 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 19:12:39,881 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 07:12:37" (1/3) ... [2019-11-06 19:12:39,882 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c4499c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 07:12:39, skipping insertion in model container [2019-11-06 19:12:39,882 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 07:12:37" (2/3) ... [2019-11-06 19:12:39,883 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c4499c7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 07:12:39, skipping insertion in model container [2019-11-06 19:12:39,883 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 07:12:39" (3/3) ... [2019-11-06 19:12:39,893 INFO L109 eAbstractionObserver]: Analyzing ICFG Problem14_label09.c [2019-11-06 19:12:39,904 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 19:12:39,920 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 19:12:39,937 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 19:12:39,994 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 19:12:39,995 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 19:12:39,997 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 19:12:39,997 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 19:12:39,998 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 19:12:39,998 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 19:12:39,998 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 19:12:39,998 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 19:12:40,045 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states. [2019-11-06 19:12:40,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-11-06 19:12:40,061 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 19:12:40,062 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 19:12:40,065 INFO L410 AbstractCegarLoop]: === Iteration 1 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 19:12:40,075 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 19:12:40,075 INFO L82 PathProgramCache]: Analyzing trace with hash 1524899170, now seen corresponding path program 1 times [2019-11-06 19:12:40,087 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 19:12:40,088 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [99901589] [2019-11-06 19:12:40,088 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 19:12:40,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:40,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:40,587 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 19:12:40,588 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [99901589] [2019-11-06 19:12:40,589 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 19:12:40,590 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 19:12:40,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [16931540] [2019-11-06 19:12:40,598 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-06 19:12:40,599 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 19:12:40,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-06 19:12:40,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2019-11-06 19:12:40,616 INFO L87 Difference]: Start difference. First operand 254 states. Second operand 5 states. [2019-11-06 19:12:43,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 19:12:43,449 INFO L93 Difference]: Finished difference Result 902 states and 1627 transitions. [2019-11-06 19:12:43,449 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 19:12:43,451 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 51 [2019-11-06 19:12:43,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 19:12:43,471 INFO L225 Difference]: With dead ends: 902 [2019-11-06 19:12:43,471 INFO L226 Difference]: Without dead ends: 564 [2019-11-06 19:12:43,480 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2019-11-06 19:12:43,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 564 states. [2019-11-06 19:12:43,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 564 to 560. [2019-11-06 19:12:43,565 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 560 states. [2019-11-06 19:12:43,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 560 states to 560 states and 782 transitions. [2019-11-06 19:12:43,571 INFO L78 Accepts]: Start accepts. Automaton has 560 states and 782 transitions. Word has length 51 [2019-11-06 19:12:43,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 19:12:43,571 INFO L462 AbstractCegarLoop]: Abstraction has 560 states and 782 transitions. [2019-11-06 19:12:43,571 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-06 19:12:43,572 INFO L276 IsEmpty]: Start isEmpty. Operand 560 states and 782 transitions. [2019-11-06 19:12:43,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2019-11-06 19:12:43,583 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 19:12:43,583 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 19:12:43,584 INFO L410 AbstractCegarLoop]: === Iteration 2 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 19:12:43,584 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 19:12:43,584 INFO L82 PathProgramCache]: Analyzing trace with hash 1193901298, now seen corresponding path program 1 times [2019-11-06 19:12:43,584 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 19:12:43,585 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [841500574] [2019-11-06 19:12:43,585 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 19:12:43,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:43,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:43,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:43,880 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 43 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 19:12:43,881 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [841500574] [2019-11-06 19:12:43,881 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1049393612] [2019-11-06 19:12:43,882 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 19:12:43,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:44,001 INFO L256 TraceCheckSpWp]: Trace formula consists of 306 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 19:12:44,012 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 19:12:44,088 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 44 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 19:12:44,089 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-06 19:12:44,089 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2019-11-06 19:12:44,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1253215433] [2019-11-06 19:12:44,092 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 19:12:44,092 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 19:12:44,092 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 19:12:44,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-11-06 19:12:44,093 INFO L87 Difference]: Start difference. First operand 560 states and 782 transitions. Second operand 3 states. [2019-11-06 19:12:45,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 19:12:45,132 INFO L93 Difference]: Finished difference Result 1666 states and 2358 transitions. [2019-11-06 19:12:45,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 19:12:45,136 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 163 [2019-11-06 19:12:45,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 19:12:45,144 INFO L225 Difference]: With dead ends: 1666 [2019-11-06 19:12:45,145 INFO L226 Difference]: Without dead ends: 1112 [2019-11-06 19:12:45,147 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-11-06 19:12:45,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1112 states. [2019-11-06 19:12:45,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1112 to 1112. [2019-11-06 19:12:45,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1112 states. [2019-11-06 19:12:45,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1112 states to 1112 states and 1515 transitions. [2019-11-06 19:12:45,206 INFO L78 Accepts]: Start accepts. Automaton has 1112 states and 1515 transitions. Word has length 163 [2019-11-06 19:12:45,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 19:12:45,207 INFO L462 AbstractCegarLoop]: Abstraction has 1112 states and 1515 transitions. [2019-11-06 19:12:45,208 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 19:12:45,208 INFO L276 IsEmpty]: Start isEmpty. Operand 1112 states and 1515 transitions. [2019-11-06 19:12:45,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2019-11-06 19:12:45,214 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 19:12:45,214 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 19:12:45,418 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 19:12:45,418 INFO L410 AbstractCegarLoop]: === Iteration 3 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 19:12:45,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 19:12:45,419 INFO L82 PathProgramCache]: Analyzing trace with hash 2142206966, now seen corresponding path program 1 times [2019-11-06 19:12:45,420 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 19:12:45,421 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [537482034] [2019-11-06 19:12:45,421 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 19:12:45,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:45,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:45,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:45,668 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 43 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 19:12:45,668 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [537482034] [2019-11-06 19:12:45,669 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1243509350] [2019-11-06 19:12:45,669 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 19:12:45,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:45,757 INFO L256 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 19:12:45,762 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 19:12:45,841 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 44 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 19:12:45,842 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-06 19:12:45,842 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2019-11-06 19:12:45,842 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1018417349] [2019-11-06 19:12:45,845 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 19:12:45,853 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 19:12:45,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 19:12:45,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-11-06 19:12:45,854 INFO L87 Difference]: Start difference. First operand 1112 states and 1515 transitions. Second operand 3 states. [2019-11-06 19:12:46,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 19:12:46,702 INFO L93 Difference]: Finished difference Result 1664 states and 2315 transitions. [2019-11-06 19:12:46,703 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 19:12:46,703 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 181 [2019-11-06 19:12:46,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 19:12:46,715 INFO L225 Difference]: With dead ends: 1664 [2019-11-06 19:12:46,715 INFO L226 Difference]: Without dead ends: 1662 [2019-11-06 19:12:46,716 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 185 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2019-11-06 19:12:46,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1662 states. [2019-11-06 19:12:46,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1662 to 1296. [2019-11-06 19:12:46,765 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1296 states. [2019-11-06 19:12:46,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1296 states to 1296 states and 1824 transitions. [2019-11-06 19:12:46,773 INFO L78 Accepts]: Start accepts. Automaton has 1296 states and 1824 transitions. Word has length 181 [2019-11-06 19:12:46,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 19:12:46,774 INFO L462 AbstractCegarLoop]: Abstraction has 1296 states and 1824 transitions. [2019-11-06 19:12:46,774 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 19:12:46,774 INFO L276 IsEmpty]: Start isEmpty. Operand 1296 states and 1824 transitions. [2019-11-06 19:12:46,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2019-11-06 19:12:46,780 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 19:12:46,780 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 19:12:46,992 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 19:12:46,992 INFO L410 AbstractCegarLoop]: === Iteration 4 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 19:12:46,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 19:12:46,993 INFO L82 PathProgramCache]: Analyzing trace with hash -791937967, now seen corresponding path program 1 times [2019-11-06 19:12:46,993 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 19:12:46,993 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1726057773] [2019-11-06 19:12:46,993 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 19:12:47,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:47,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:47,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:47,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:47,640 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 148 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 19:12:47,640 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1726057773] [2019-11-06 19:12:47,641 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1004348550] [2019-11-06 19:12:47,641 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 19:12:47,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:47,742 INFO L256 TraceCheckSpWp]: Trace formula consists of 416 conjuncts, 11 conjunts are in the unsatisfiable core [2019-11-06 19:12:47,789 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 19:12:47,860 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-11-06 19:12:47,972 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 116 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-11-06 19:12:47,973 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-06 19:12:47,973 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [12] total 15 [2019-11-06 19:12:47,974 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [757236024] [2019-11-06 19:12:47,974 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-06 19:12:47,975 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 19:12:47,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-06 19:12:47,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2019-11-06 19:12:47,976 INFO L87 Difference]: Start difference. First operand 1296 states and 1824 transitions. Second operand 5 states. [2019-11-06 19:12:49,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 19:12:49,343 INFO L93 Difference]: Finished difference Result 2982 states and 4167 transitions. [2019-11-06 19:12:49,343 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 19:12:49,343 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 236 [2019-11-06 19:12:49,344 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 19:12:49,354 INFO L225 Difference]: With dead ends: 2982 [2019-11-06 19:12:49,354 INFO L226 Difference]: Without dead ends: 1692 [2019-11-06 19:12:49,358 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 239 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=249, Unknown=0, NotChecked=0, Total=306 [2019-11-06 19:12:49,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1692 states. [2019-11-06 19:12:49,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1692 to 1684. [2019-11-06 19:12:49,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1684 states. [2019-11-06 19:12:49,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1684 states to 1684 states and 2289 transitions. [2019-11-06 19:12:49,408 INFO L78 Accepts]: Start accepts. Automaton has 1684 states and 2289 transitions. Word has length 236 [2019-11-06 19:12:49,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 19:12:49,408 INFO L462 AbstractCegarLoop]: Abstraction has 1684 states and 2289 transitions. [2019-11-06 19:12:49,408 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-06 19:12:49,409 INFO L276 IsEmpty]: Start isEmpty. Operand 1684 states and 2289 transitions. [2019-11-06 19:12:49,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 264 [2019-11-06 19:12:49,414 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 19:12:49,414 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 19:12:49,621 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 19:12:49,622 INFO L410 AbstractCegarLoop]: === Iteration 5 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 19:12:49,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 19:12:49,623 INFO L82 PathProgramCache]: Analyzing trace with hash 1222821270, now seen corresponding path program 1 times [2019-11-06 19:12:49,623 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 19:12:49,623 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [934497427] [2019-11-06 19:12:49,624 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 19:12:49,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:49,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:49,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:49,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:49,941 INFO L134 CoverageAnalysis]: Checked inductivity of 191 backedges. 185 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-11-06 19:12:49,941 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [934497427] [2019-11-06 19:12:49,941 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1569946076] [2019-11-06 19:12:49,941 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 19:12:50,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:50,058 INFO L256 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 19:12:50,094 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 19:12:50,169 INFO L134 CoverageAnalysis]: Checked inductivity of 191 backedges. 189 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 19:12:50,169 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 19:12:50,169 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 5] total 11 [2019-11-06 19:12:50,170 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [511890402] [2019-11-06 19:12:50,170 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-06 19:12:50,171 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 19:12:50,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-06 19:12:50,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=77, Unknown=0, NotChecked=0, Total=110 [2019-11-06 19:12:50,171 INFO L87 Difference]: Start difference. First operand 1684 states and 2289 transitions. Second operand 11 states. [2019-11-06 19:12:52,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 19:12:52,383 INFO L93 Difference]: Finished difference Result 4196 states and 6313 transitions. [2019-11-06 19:12:52,383 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 19:12:52,383 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 263 [2019-11-06 19:12:52,384 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 19:12:52,399 INFO L225 Difference]: With dead ends: 4196 [2019-11-06 19:12:52,399 INFO L226 Difference]: Without dead ends: 2700 [2019-11-06 19:12:52,404 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 266 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=84, Invalid=188, Unknown=0, NotChecked=0, Total=272 [2019-11-06 19:12:52,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2700 states. [2019-11-06 19:12:52,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2700 to 2634. [2019-11-06 19:12:52,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2634 states. [2019-11-06 19:12:52,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2634 states to 2634 states and 3570 transitions. [2019-11-06 19:12:52,500 INFO L78 Accepts]: Start accepts. Automaton has 2634 states and 3570 transitions. Word has length 263 [2019-11-06 19:12:52,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 19:12:52,501 INFO L462 AbstractCegarLoop]: Abstraction has 2634 states and 3570 transitions. [2019-11-06 19:12:52,501 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-06 19:12:52,501 INFO L276 IsEmpty]: Start isEmpty. Operand 2634 states and 3570 transitions. [2019-11-06 19:12:52,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 321 [2019-11-06 19:12:52,508 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 19:12:52,508 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 19:12:52,718 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 19:12:52,718 INFO L410 AbstractCegarLoop]: === Iteration 6 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 19:12:52,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 19:12:52,719 INFO L82 PathProgramCache]: Analyzing trace with hash 1221316153, now seen corresponding path program 1 times [2019-11-06 19:12:52,719 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 19:12:52,719 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583661047] [2019-11-06 19:12:52,719 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 19:12:52,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:52,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:52,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:52,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:53,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:53,744 INFO L134 CoverageAnalysis]: Checked inductivity of 362 backedges. 142 proven. 213 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-11-06 19:12:53,744 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1583661047] [2019-11-06 19:12:53,745 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1918692768] [2019-11-06 19:12:53,745 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 19:12:53,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:53,855 INFO L256 TraceCheckSpWp]: Trace formula consists of 539 conjuncts, 26 conjunts are in the unsatisfiable core [2019-11-06 19:12:53,860 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 19:12:53,928 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 4 terms [2019-11-06 19:12:54,114 INFO L134 CoverageAnalysis]: Checked inductivity of 362 backedges. 264 proven. 53 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-11-06 19:12:54,115 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 19:12:54,115 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 8] total 16 [2019-11-06 19:12:54,115 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [551831221] [2019-11-06 19:12:54,116 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-06 19:12:54,116 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 19:12:54,116 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-06 19:12:54,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=182, Unknown=0, NotChecked=0, Total=240 [2019-11-06 19:12:54,117 INFO L87 Difference]: Start difference. First operand 2634 states and 3570 transitions. Second operand 16 states. [2019-11-06 19:12:58,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 19:12:58,168 INFO L93 Difference]: Finished difference Result 5572 states and 7555 transitions. [2019-11-06 19:12:58,168 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-06 19:12:58,168 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 320 [2019-11-06 19:12:58,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 19:12:58,179 INFO L225 Difference]: With dead ends: 5572 [2019-11-06 19:12:58,179 INFO L226 Difference]: Without dead ends: 3081 [2019-11-06 19:12:58,187 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 374 GetRequests, 341 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 261 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=276, Invalid=914, Unknown=0, NotChecked=0, Total=1190 [2019-11-06 19:12:58,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3081 states. [2019-11-06 19:12:58,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3081 to 3010. [2019-11-06 19:12:58,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3010 states. [2019-11-06 19:12:58,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3010 states to 3010 states and 3718 transitions. [2019-11-06 19:12:58,285 INFO L78 Accepts]: Start accepts. Automaton has 3010 states and 3718 transitions. Word has length 320 [2019-11-06 19:12:58,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 19:12:58,285 INFO L462 AbstractCegarLoop]: Abstraction has 3010 states and 3718 transitions. [2019-11-06 19:12:58,285 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-06 19:12:58,285 INFO L276 IsEmpty]: Start isEmpty. Operand 3010 states and 3718 transitions. [2019-11-06 19:12:58,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 346 [2019-11-06 19:12:58,292 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 19:12:58,293 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 19:12:58,498 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 19:12:58,499 INFO L410 AbstractCegarLoop]: === Iteration 7 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 19:12:58,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 19:12:58,499 INFO L82 PathProgramCache]: Analyzing trace with hash -1239300566, now seen corresponding path program 1 times [2019-11-06 19:12:58,499 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 19:12:58,500 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [387077566] [2019-11-06 19:12:58,500 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 19:12:58,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:58,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:58,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:58,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:58,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:59,341 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 233 proven. 85 refuted. 0 times theorem prover too weak. 69 trivial. 0 not checked. [2019-11-06 19:12:59,341 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [387077566] [2019-11-06 19:12:59,342 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [22304375] [2019-11-06 19:12:59,342 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 19:12:59,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:12:59,469 INFO L256 TraceCheckSpWp]: Trace formula consists of 563 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 19:12:59,476 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 19:12:59,500 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 3 terms [2019-11-06 19:12:59,598 INFO L134 CoverageAnalysis]: Checked inductivity of 387 backedges. 224 proven. 0 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2019-11-06 19:12:59,598 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-06 19:12:59,599 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [13] total 16 [2019-11-06 19:12:59,599 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1131320366] [2019-11-06 19:12:59,600 INFO L442 AbstractCegarLoop]: Interpolant automaton has 5 states [2019-11-06 19:12:59,600 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 19:12:59,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2019-11-06 19:12:59,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2019-11-06 19:12:59,601 INFO L87 Difference]: Start difference. First operand 3010 states and 3718 transitions. Second operand 5 states. [2019-11-06 19:13:00,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 19:13:00,705 INFO L93 Difference]: Finished difference Result 6214 states and 7832 transitions. [2019-11-06 19:13:00,708 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 19:13:00,709 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 345 [2019-11-06 19:13:00,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 19:13:00,722 INFO L225 Difference]: With dead ends: 6214 [2019-11-06 19:13:00,723 INFO L226 Difference]: Without dead ends: 3394 [2019-11-06 19:13:00,732 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 370 GetRequests, 352 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=72, Invalid=270, Unknown=0, NotChecked=0, Total=342 [2019-11-06 19:13:00,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3394 states. [2019-11-06 19:13:00,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3394 to 3388. [2019-11-06 19:13:00,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3388 states. [2019-11-06 19:13:00,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3388 states to 3388 states and 4140 transitions. [2019-11-06 19:13:00,814 INFO L78 Accepts]: Start accepts. Automaton has 3388 states and 4140 transitions. Word has length 345 [2019-11-06 19:13:00,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 19:13:00,814 INFO L462 AbstractCegarLoop]: Abstraction has 3388 states and 4140 transitions. [2019-11-06 19:13:00,814 INFO L463 AbstractCegarLoop]: Interpolant automaton has 5 states. [2019-11-06 19:13:00,815 INFO L276 IsEmpty]: Start isEmpty. Operand 3388 states and 4140 transitions. [2019-11-06 19:13:00,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 456 [2019-11-06 19:13:00,827 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 19:13:00,827 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 19:13:01,035 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 19:13:01,035 INFO L410 AbstractCegarLoop]: === Iteration 8 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 19:13:01,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 19:13:01,036 INFO L82 PathProgramCache]: Analyzing trace with hash 1989573846, now seen corresponding path program 1 times [2019-11-06 19:13:01,036 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 19:13:01,036 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [69849766] [2019-11-06 19:13:01,037 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 19:13:01,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:01,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:01,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:01,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:01,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:01,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:01,843 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 402 proven. 72 refuted. 0 times theorem prover too weak. 249 trivial. 0 not checked. [2019-11-06 19:13:01,844 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [69849766] [2019-11-06 19:13:01,844 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [334869231] [2019-11-06 19:13:01,844 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 19:13:01,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:01,986 INFO L256 TraceCheckSpWp]: Trace formula consists of 710 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 19:13:01,994 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 19:13:02,091 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 570 proven. 2 refuted. 0 times theorem prover too weak. 151 trivial. 0 not checked. [2019-11-06 19:13:02,091 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 19:13:02,092 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 5] total 9 [2019-11-06 19:13:02,092 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [992962425] [2019-11-06 19:13:02,093 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 19:13:02,093 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 19:13:02,093 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 19:13:02,093 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2019-11-06 19:13:02,093 INFO L87 Difference]: Start difference. First operand 3388 states and 4140 transitions. Second operand 9 states. [2019-11-06 19:13:04,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 19:13:04,379 INFO L93 Difference]: Finished difference Result 7520 states and 9257 transitions. [2019-11-06 19:13:04,379 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 19:13:04,379 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 455 [2019-11-06 19:13:04,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 19:13:04,396 INFO L225 Difference]: With dead ends: 7520 [2019-11-06 19:13:04,396 INFO L226 Difference]: Without dead ends: 4322 [2019-11-06 19:13:04,404 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 468 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=144, Unknown=0, NotChecked=0, Total=210 [2019-11-06 19:13:04,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4322 states. [2019-11-06 19:13:04,488 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4322 to 4138. [2019-11-06 19:13:04,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4138 states. [2019-11-06 19:13:04,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4138 states to 4138 states and 4908 transitions. [2019-11-06 19:13:04,497 INFO L78 Accepts]: Start accepts. Automaton has 4138 states and 4908 transitions. Word has length 455 [2019-11-06 19:13:04,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 19:13:04,498 INFO L462 AbstractCegarLoop]: Abstraction has 4138 states and 4908 transitions. [2019-11-06 19:13:04,498 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 19:13:04,498 INFO L276 IsEmpty]: Start isEmpty. Operand 4138 states and 4908 transitions. [2019-11-06 19:13:04,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 541 [2019-11-06 19:13:04,507 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 19:13:04,508 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 19:13:04,712 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 19:13:04,713 INFO L410 AbstractCegarLoop]: === Iteration 9 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 19:13:04,713 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 19:13:04,713 INFO L82 PathProgramCache]: Analyzing trace with hash -155868599, now seen corresponding path program 1 times [2019-11-06 19:13:04,714 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 19:13:04,714 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084392019] [2019-11-06 19:13:04,714 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 19:13:04,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:04,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:04,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:04,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:04,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:05,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:05,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:06,086 INFO L134 CoverageAnalysis]: Checked inductivity of 1096 backedges. 538 proven. 81 refuted. 0 times theorem prover too weak. 477 trivial. 0 not checked. [2019-11-06 19:13:06,086 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084392019] [2019-11-06 19:13:06,087 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [196880072] [2019-11-06 19:13:06,087 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 19:13:06,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:06,231 INFO L256 TraceCheckSpWp]: Trace formula consists of 836 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 19:13:06,238 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 19:13:06,414 INFO L134 CoverageAnalysis]: Checked inductivity of 1096 backedges. 232 proven. 0 refuted. 0 times theorem prover too weak. 864 trivial. 0 not checked. [2019-11-06 19:13:06,414 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-11-06 19:13:06,415 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [11] total 12 [2019-11-06 19:13:06,418 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [937935148] [2019-11-06 19:13:06,419 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 19:13:06,419 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 19:13:06,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 19:13:06,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2019-11-06 19:13:06,422 INFO L87 Difference]: Start difference. First operand 4138 states and 4908 transitions. Second operand 3 states. [2019-11-06 19:13:07,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 19:13:07,267 INFO L93 Difference]: Finished difference Result 5784 states and 6808 transitions. [2019-11-06 19:13:07,267 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 19:13:07,267 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 540 [2019-11-06 19:13:07,268 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 19:13:07,288 INFO L225 Difference]: With dead ends: 5784 [2019-11-06 19:13:07,288 INFO L226 Difference]: Without dead ends: 5782 [2019-11-06 19:13:07,291 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 564 GetRequests, 553 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2019-11-06 19:13:07,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5782 states. [2019-11-06 19:13:07,392 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5782 to 4322. [2019-11-06 19:13:07,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4322 states. [2019-11-06 19:13:07,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4322 states to 4322 states and 5134 transitions. [2019-11-06 19:13:07,400 INFO L78 Accepts]: Start accepts. Automaton has 4322 states and 5134 transitions. Word has length 540 [2019-11-06 19:13:07,401 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 19:13:07,401 INFO L462 AbstractCegarLoop]: Abstraction has 4322 states and 5134 transitions. [2019-11-06 19:13:07,401 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 19:13:07,401 INFO L276 IsEmpty]: Start isEmpty. Operand 4322 states and 5134 transitions. [2019-11-06 19:13:07,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 561 [2019-11-06 19:13:07,409 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 19:13:07,410 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 19:13:07,614 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 19:13:07,614 INFO L410 AbstractCegarLoop]: === Iteration 10 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 19:13:07,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 19:13:07,615 INFO L82 PathProgramCache]: Analyzing trace with hash 1921617981, now seen corresponding path program 1 times [2019-11-06 19:13:07,615 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 19:13:07,615 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [330566629] [2019-11-06 19:13:07,615 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 19:13:07,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:07,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:07,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:07,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:07,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:07,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:08,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:09,067 INFO L134 CoverageAnalysis]: Checked inductivity of 1092 backedges. 538 proven. 80 refuted. 0 times theorem prover too weak. 474 trivial. 0 not checked. [2019-11-06 19:13:09,068 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [330566629] [2019-11-06 19:13:09,068 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [138096698] [2019-11-06 19:13:09,068 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 19:13:09,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 19:13:09,238 INFO L256 TraceCheckSpWp]: Trace formula consists of 854 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-06 19:13:09,256 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 19:13:09,313 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 4 terms [2019-11-06 19:13:09,844 INFO L134 CoverageAnalysis]: Checked inductivity of 1092 backedges. 774 proven. 2 refuted. 0 times theorem prover too weak. 316 trivial. 0 not checked. [2019-11-06 19:13:09,845 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 19:13:09,845 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 6] total 16 [2019-11-06 19:13:09,845 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1980038148] [2019-11-06 19:13:09,846 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-06 19:13:09,846 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 19:13:09,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-06 19:13:09,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2019-11-06 19:13:09,847 INFO L87 Difference]: Start difference. First operand 4322 states and 5134 transitions. Second operand 16 states. [2019-11-06 19:13:12,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 19:13:12,871 INFO L93 Difference]: Finished difference Result 8777 states and 10443 transitions. [2019-11-06 19:13:12,871 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-06 19:13:12,871 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 560 [2019-11-06 19:13:12,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 19:13:12,887 INFO L225 Difference]: With dead ends: 8777 [2019-11-06 19:13:12,887 INFO L226 Difference]: Without dead ends: 4567 [2019-11-06 19:13:12,896 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 606 GetRequests, 579 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=179, Invalid=577, Unknown=0, NotChecked=0, Total=756 [2019-11-06 19:13:12,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4567 states. [2019-11-06 19:13:12,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4567 to 4502. [2019-11-06 19:13:12,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4502 states. [2019-11-06 19:13:12,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4502 states to 4502 states and 5106 transitions. [2019-11-06 19:13:12,985 INFO L78 Accepts]: Start accepts. Automaton has 4502 states and 5106 transitions. Word has length 560 [2019-11-06 19:13:12,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 19:13:12,986 INFO L462 AbstractCegarLoop]: Abstraction has 4502 states and 5106 transitions. [2019-11-06 19:13:12,986 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-06 19:13:12,987 INFO L276 IsEmpty]: Start isEmpty. Operand 4502 states and 5106 transitions. [2019-11-06 19:13:12,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 587 [2019-11-06 19:13:12,995 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 19:13:12,996 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 19:13:13,200 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 19:13:13,201 INFO L410 AbstractCegarLoop]: === Iteration 11 === [calculate_outputErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 19:13:13,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 19:13:13,201 INFO L82 PathProgramCache]: Analyzing trace with hash 469991441, now seen corresponding path program 1 times [2019-11-06 19:13:13,201 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 19:13:13,201 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [529719535] [2019-11-06 19:13:13,202 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 19:13:13,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat