/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/nla-digbench-scaling/lcm2_unwindbound5.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 16:04:43,412 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 16:04:43,415 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 16:04:43,460 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 16:04:43,469 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 16:04:43,470 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 16:04:43,471 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 16:04:43,472 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 16:04:43,473 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 16:04:43,474 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 16:04:43,475 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 16:04:43,477 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 16:04:43,478 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 16:04:43,480 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 16:04:43,481 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 16:04:43,482 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 16:04:43,484 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 16:04:43,491 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 16:04:43,504 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 16:04:43,507 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 16:04:43,511 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 [2021-05-02 16:04:43,546 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 16:04:43,546 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 16:04:43,549 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 16:04:43,549 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 16:04:43,549 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 16:04:43,549 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 16:04:43,549 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 16:04:43,549 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 16:04:43,550 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 16:04:43,550 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 16:04:43,550 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 16:04:43,551 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 16:04:43,551 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 16:04:43,551 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 16:04:43,551 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 16:04:43,551 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 16:04:43,551 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 16:04:43,552 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 16:04:43,552 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 16:04:43,552 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 16:04:43,552 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 16:04:43,552 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 16:04:43,552 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 16:04:43,552 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 16:04:43,553 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 16:04:43,553 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 16:04:43,553 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 16:04:43,553 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 16:04:43,553 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 16:04:43,907 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 16:04:43,929 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 16:04:43,932 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 16:04:43,933 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 16:04:43,933 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 16:04:43,934 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/lcm2_unwindbound5.c [2021-05-02 16:04:44,003 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ee089aef2/5245970a5fa946789af398eb21f09049/FLAG8c2966d24 [2021-05-02 16:04:44,520 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 16:04:44,520 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/lcm2_unwindbound5.c [2021-05-02 16:04:44,527 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ee089aef2/5245970a5fa946789af398eb21f09049/FLAG8c2966d24 [2021-05-02 16:04:45,002 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ee089aef2/5245970a5fa946789af398eb21f09049 [2021-05-02 16:04:45,005 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 16:04:45,007 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 16:04:45,012 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 16:04:45,012 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 16:04:45,017 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 16:04:45,017 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 04:04:45" (1/1) ... [2021-05-02 16:04:45,018 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6354d1f4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:04:45, skipping insertion in model container [2021-05-02 16:04:45,019 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 04:04:45" (1/1) ... [2021-05-02 16:04:45,027 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 16:04:45,041 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 16:04:45,202 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/lcm2_unwindbound5.c[545,558] [2021-05-02 16:04:45,227 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 16:04:45,235 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 16:04:45,267 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/lcm2_unwindbound5.c[545,558] [2021-05-02 16:04:45,292 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 16:04:45,307 INFO L208 MainTranslator]: Completed translation [2021-05-02 16:04:45,308 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:04:45 WrapperNode [2021-05-02 16:04:45,308 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 16:04:45,309 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 16:04:45,309 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 16:04:45,310 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 16:04:45,320 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:04:45" (1/1) ... [2021-05-02 16:04:45,320 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:04:45" (1/1) ... [2021-05-02 16:04:45,333 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:04:45" (1/1) ... [2021-05-02 16:04:45,334 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:04:45" (1/1) ... [2021-05-02 16:04:45,345 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:04:45" (1/1) ... [2021-05-02 16:04:45,348 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:04:45" (1/1) ... [2021-05-02 16:04:45,349 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:04:45" (1/1) ... [2021-05-02 16:04:45,351 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 16:04:45,351 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 16:04:45,351 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 16:04:45,351 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 16:04:45,352 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:04:45" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 16:04:45,429 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 16:04:45,429 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 16:04:45,429 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 16:04:45,429 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 16:04:45,430 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 16:04:45,430 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 16:04:45,430 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 16:04:45,430 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 16:04:45,430 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 16:04:45,431 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 16:04:45,431 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-02 16:04:45,431 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 16:04:45,431 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 16:04:45,432 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 16:04:45,432 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 16:04:45,432 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 16:04:45,432 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 16:04:45,432 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 16:04:45,432 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 16:04:45,433 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 16:04:45,708 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 16:04:45,709 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-02 16:04:45,710 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 04:04:45 BoogieIcfgContainer [2021-05-02 16:04:45,710 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 16:04:45,711 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 16:04:45,711 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 16:04:45,714 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 16:04:45,714 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 04:04:45" (1/3) ... [2021-05-02 16:04:45,715 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@fd002c2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 04:04:45, skipping insertion in model container [2021-05-02 16:04:45,715 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 04:04:45" (2/3) ... [2021-05-02 16:04:45,715 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@fd002c2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 04:04:45, skipping insertion in model container [2021-05-02 16:04:45,715 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 04:04:45" (3/3) ... [2021-05-02 16:04:45,716 INFO L111 eAbstractionObserver]: Analyzing ICFG lcm2_unwindbound5.c [2021-05-02 16:04:45,721 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 16:04:45,724 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 16:04:45,738 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 16:04:45,757 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 16:04:45,757 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 16:04:45,757 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 16:04:45,757 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 16:04:45,757 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 16:04:45,758 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 16:04:45,758 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 16:04:45,758 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 16:04:45,770 INFO L276 IsEmpty]: Start isEmpty. Operand has 32 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-02 16:04:45,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 16:04:45,775 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:04:45,776 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:04:45,776 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:04:45,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:04:45,780 INFO L82 PathProgramCache]: Analyzing trace with hash 2009995470, now seen corresponding path program 1 times [2021-05-02 16:04:45,788 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:04:45,788 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [469380750] [2021-05-02 16:04:45,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:04:45,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:04:46,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 16:04:46,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:04:46,042 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 16:04:46,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:04:46,053 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 16:04:46,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:04:46,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 16 [2021-05-02 16:04:46,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:04:46,063 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 21 [2021-05-02 16:04:46,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:04:46,069 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 16:04:46,070 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:04:46,070 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [469380750] [2021-05-02 16:04:46,070 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [469380750] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 16:04:46,071 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 16:04:46,071 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 16:04:46,071 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059765050] [2021-05-02 16:04:46,075 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 16:04:46,076 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:04:46,089 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 16:04:46,090 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 16:04:46,091 INFO L87 Difference]: Start difference. First operand has 32 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 19 states have internal predecessors, (25), 8 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 16:04:46,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:04:46,194 INFO L93 Difference]: Finished difference Result 58 states and 82 transitions. [2021-05-02 16:04:46,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 16:04:46,196 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 32 [2021-05-02 16:04:46,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:04:46,202 INFO L225 Difference]: With dead ends: 58 [2021-05-02 16:04:46,202 INFO L226 Difference]: Without dead ends: 28 [2021-05-02 16:04:46,204 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 65.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 16:04:46,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-05-02 16:04:46,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2021-05-02 16:04:46,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 16 states have internal predecessors, (19), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 16:04:46,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2021-05-02 16:04:46,239 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 32 [2021-05-02 16:04:46,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:04:46,240 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2021-05-02 16:04:46,240 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 2 states have call successors, (7), 3 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 16:04:46,240 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2021-05-02 16:04:46,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 16:04:46,241 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:04:46,242 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:04:46,242 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 16:04:46,242 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:04:46,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:04:46,243 INFO L82 PathProgramCache]: Analyzing trace with hash -756409738, now seen corresponding path program 1 times [2021-05-02 16:04:46,243 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:04:46,243 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [919460042] [2021-05-02 16:04:46,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:04:46,265 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:04:46,265 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [897260719] [2021-05-02 16:04:46,265 INFO L95 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 [2021-05-02 16:04:46,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:04:46,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 16:04:46,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:04:46,418 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:46,433 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:46,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:46,507 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:46,510 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:46,527 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 16:04:46,527 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:04:46,527 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [919460042] [2021-05-02 16:04:46,540 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:04:46,541 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [897260719] [2021-05-02 16:04:46,541 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [897260719] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 16:04:46,541 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 16:04:46,541 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 16:04:46,541 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752233868] [2021-05-02 16:04:46,543 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 16:04:46,543 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:04:46,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 16:04:46,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 16:04:46,544 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 16:04:46,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:04:46,563 INFO L93 Difference]: Finished difference Result 36 states and 42 transitions. [2021-05-02 16:04:46,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 16:04:46,563 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) Word has length 33 [2021-05-02 16:04:46,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:04:46,564 INFO L225 Difference]: With dead ends: 36 [2021-05-02 16:04:46,565 INFO L226 Difference]: Without dead ends: 29 [2021-05-02 16:04:46,565 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 7.1ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 16:04:46,566 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-02 16:04:46,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-05-02 16:04:46,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 8 states have call successors, (8), 4 states have call predecessors, (8), 3 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-02 16:04:46,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2021-05-02 16:04:46,574 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 33 [2021-05-02 16:04:46,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:04:46,576 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2021-05-02 16:04:46,576 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 3 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 16:04:46,576 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2021-05-02 16:04:46,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 16:04:46,578 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:04:46,578 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-02 16:04:46,778 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 16:04:46,779 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:04:46,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:04:46,779 INFO L82 PathProgramCache]: Analyzing trace with hash -754622278, now seen corresponding path program 1 times [2021-05-02 16:04:46,780 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:04:46,780 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1403661043] [2021-05-02 16:04:46,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:04:46,814 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:04:46,815 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1072106943] [2021-05-02 16:04:46,815 INFO L95 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 [2021-05-02 16:04:47,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:04:47,077 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-02 16:04:47,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:04:47,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:47,131 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:47,147 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:47,150 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:47,189 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:47,195 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:47,254 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:47,258 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:47,265 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:47,276 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:47,282 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:47,289 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:47,322 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 16:04:47,322 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:04:47,322 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1403661043] [2021-05-02 16:04:47,322 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:04:47,322 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1072106943] [2021-05-02 16:04:47,322 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1072106943] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:04:47,322 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:04:47,323 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 16:04:47,323 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889662006] [2021-05-02 16:04:47,323 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 16:04:47,323 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:04:47,324 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 16:04:47,324 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 16:04:47,324 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 16:04:49,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:04:49,499 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2021-05-02 16:04:49,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 16:04:49,501 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 33 [2021-05-02 16:04:49,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:04:49,502 INFO L225 Difference]: With dead ends: 39 [2021-05-02 16:04:49,502 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 16:04:49,503 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 55.5ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 16:04:49,503 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 16:04:49,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2021-05-02 16:04:49,509 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 22 states have internal predecessors, (25), 9 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 16:04:49,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2021-05-02 16:04:49,510 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 33 [2021-05-02 16:04:49,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:04:49,511 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2021-05-02 16:04:49,511 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 16:04:49,511 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2021-05-02 16:04:49,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 16:04:49,512 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:04:49,512 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 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] [2021-05-02 16:04:49,721 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:04:49,722 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:04:49,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:04:49,722 INFO L82 PathProgramCache]: Analyzing trace with hash 756635198, now seen corresponding path program 1 times [2021-05-02 16:04:49,722 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:04:49,723 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [436173223] [2021-05-02 16:04:49,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:04:49,739 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:04:49,739 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1401658730] [2021-05-02 16:04:49,739 INFO L95 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 [2021-05-02 16:04:49,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 16:04:49,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 16:04:49,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 16:04:49,812 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:49,815 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:49,816 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:49,866 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:49,878 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:49,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:49,914 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:49,919 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 16:04:49,936 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 16:04:49,936 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 16:04:49,936 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [436173223] [2021-05-02 16:04:49,936 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 16:04:49,936 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1401658730] [2021-05-02 16:04:49,937 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1401658730] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 16:04:49,937 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 16:04:49,937 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2021-05-02 16:04:49,937 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422506168] [2021-05-02 16:04:49,938 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 16:04:49,939 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 16:04:49,941 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 16:04:49,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 16:04:49,942 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 4 states have call successors, (8), 4 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 16:04:50,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 16:04:50,004 INFO L93 Difference]: Finished difference Result 45 states and 52 transitions. [2021-05-02 16:04:50,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 16:04:50,004 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 4 states have call successors, (8), 4 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 3 states have call successors, (6) Word has length 42 [2021-05-02 16:04:50,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 16:04:50,008 INFO L225 Difference]: With dead ends: 45 [2021-05-02 16:04:50,008 INFO L226 Difference]: Without dead ends: 38 [2021-05-02 16:04:50,009 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 19.5ms TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 16:04:50,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-05-02 16:04:50,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2021-05-02 16:04:50,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 25 states have internal predecessors, (29), 9 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-05-02 16:04:50,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 45 transitions. [2021-05-02 16:04:50,026 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 45 transitions. Word has length 42 [2021-05-02 16:04:50,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 16:04:50,028 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 45 transitions. [2021-05-02 16:04:50,029 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 4 states have call successors, (8), 4 states have call predecessors, (8), 2 states have return successors, (6), 2 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 16:04:50,029 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 45 transitions. [2021-05-02 16:04:50,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-05-02 16:04:50,032 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 16:04:50,032 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 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] [2021-05-02 16:04:50,257 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 16:04:50,258 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 16:04:50,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 16:04:50,259 INFO L82 PathProgramCache]: Analyzing trace with hash 758422658, now seen corresponding path program 1 times [2021-05-02 16:04:50,259 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 16:04:50,259 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2141066760] [2021-05-02 16:04:50,259 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 16:04:50,273 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 16:04:50,273 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [2069896195] [2021-05-02 16:04:50,273 INFO L95 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