/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/egcd2-ll_unwindbound2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-02 14:51:27,185 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-02 14:51:27,187 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-02 14:51:27,217 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-02 14:51:27,232 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-02 14:51:27,233 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-02 14:51:27,234 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-02 14:51:27,235 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-02 14:51:27,241 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-02 14:51:27,241 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-02 14:51:27,242 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-02 14:51:27,243 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-02 14:51:27,244 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-02 14:51:27,245 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-02 14:51:27,245 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-02 14:51:27,245 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-02 14:51:27,247 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-02 14:51:27,251 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-02 14:51:27,251 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-02 14:51:27,252 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-02 14:51:27,252 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 14:51:27,266 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-02 14:51:27,266 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-02 14:51:27,267 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-02 14:51:27,267 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-02 14:51:27,267 INFO L138 SettingsManager]: * Use SBE=true [2021-05-02 14:51:27,267 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-02 14:51:27,267 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-02 14:51:27,268 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-02 14:51:27,268 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-02 14:51:27,268 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-02 14:51:27,268 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-02 14:51:27,268 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-02 14:51:27,268 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-02 14:51:27,268 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-02 14:51:27,268 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-02 14:51:27,268 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-02 14:51:27,268 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-02 14:51:27,269 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-02 14:51:27,269 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-02 14:51:27,269 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-02 14:51:27,269 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-02 14:51:27,269 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-02 14:51:27,269 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-02 14:51:27,269 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-02 14:51:27,269 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-02 14:51:27,269 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-02 14:51:27,269 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-02 14:51:27,270 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-02 14:51:27,270 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-02 14:51:27,516 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-02 14:51:27,537 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-02 14:51:27,539 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-02 14:51:27,540 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-02 14:51:27,541 INFO L275 PluginConnector]: CDTParser initialized [2021-05-02 14:51:27,541 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/egcd2-ll_unwindbound2.c [2021-05-02 14:51:27,614 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5512a7fb9/4e5c5302f85a4a92837493561b419b88/FLAG1a7b0080d [2021-05-02 14:51:28,075 INFO L306 CDTParser]: Found 1 translation units. [2021-05-02 14:51:28,076 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/egcd2-ll_unwindbound2.c [2021-05-02 14:51:28,081 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5512a7fb9/4e5c5302f85a4a92837493561b419b88/FLAG1a7b0080d [2021-05-02 14:51:28,096 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/5512a7fb9/4e5c5302f85a4a92837493561b419b88 [2021-05-02 14:51:28,098 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-02 14:51:28,099 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-02 14:51:28,100 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-02 14:51:28,101 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-02 14:51:28,103 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-02 14:51:28,104 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:51:28" (1/1) ... [2021-05-02 14:51:28,104 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@347ab0e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:28, skipping insertion in model container [2021-05-02 14:51:28,105 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.05 02:51:28" (1/1) ... [2021-05-02 14:51:28,109 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-02 14:51:28,120 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-02 14:51:28,206 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/egcd2-ll_unwindbound2.c[490,503] [2021-05-02 14:51:28,219 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:51:28,224 INFO L203 MainTranslator]: Completed pre-run [2021-05-02 14:51:28,259 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/egcd2-ll_unwindbound2.c[490,503] [2021-05-02 14:51:28,265 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-02 14:51:28,278 INFO L208 MainTranslator]: Completed translation [2021-05-02 14:51:28,278 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:28 WrapperNode [2021-05-02 14:51:28,278 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-02 14:51:28,279 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-02 14:51:28,279 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-02 14:51:28,279 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-02 14:51:28,286 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:28" (1/1) ... [2021-05-02 14:51:28,286 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:28" (1/1) ... [2021-05-02 14:51:28,291 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:28" (1/1) ... [2021-05-02 14:51:28,291 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:28" (1/1) ... [2021-05-02 14:51:28,294 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:28" (1/1) ... [2021-05-02 14:51:28,297 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:28" (1/1) ... [2021-05-02 14:51:28,298 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:28" (1/1) ... [2021-05-02 14:51:28,299 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-02 14:51:28,300 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-02 14:51:28,300 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-02 14:51:28,300 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-02 14:51:28,301 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:28" (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 14:51:28,389 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-02 14:51:28,389 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-02 14:51:28,389 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-02 14:51:28,389 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-02 14:51:28,389 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-02 14:51:28,390 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-02 14:51:28,390 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-02 14:51:28,390 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-02 14:51:28,390 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-02 14:51:28,390 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-02 14:51:28,390 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-02 14:51:28,390 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-02 14:51:28,391 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-02 14:51:28,391 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-02 14:51:28,391 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-02 14:51:28,392 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-02 14:51:28,392 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-02 14:51:28,392 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-02 14:51:28,392 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-02 14:51:28,392 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-02 14:51:28,690 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-02 14:51:28,690 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-02 14:51:28,691 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:51:28 BoogieIcfgContainer [2021-05-02 14:51:28,691 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-02 14:51:28,692 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-02 14:51:28,692 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-02 14:51:28,694 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-02 14:51:28,694 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.05 02:51:28" (1/3) ... [2021-05-02 14:51:28,694 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d2c68c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:51:28, skipping insertion in model container [2021-05-02 14:51:28,694 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.05 02:51:28" (2/3) ... [2021-05-02 14:51:28,695 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d2c68c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.05 02:51:28, skipping insertion in model container [2021-05-02 14:51:28,695 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.05 02:51:28" (3/3) ... [2021-05-02 14:51:28,696 INFO L111 eAbstractionObserver]: Analyzing ICFG egcd2-ll_unwindbound2.c [2021-05-02 14:51:28,705 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-02 14:51:28,708 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-02 14:51:28,720 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-02 14:51:28,745 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-02 14:51:28,746 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-02 14:51:28,746 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-02 14:51:28,746 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-02 14:51:28,746 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-02 14:51:28,746 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-02 14:51:28,746 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-02 14:51:28,746 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-02 14:51:28,759 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 23 states have internal predecessors, (30), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-05-02 14:51:28,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-02 14:51:28,765 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:28,766 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 14:51:28,766 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:28,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:28,771 INFO L82 PathProgramCache]: Analyzing trace with hash 1950618521, now seen corresponding path program 1 times [2021-05-02 14:51:28,782 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:28,782 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1082946972] [2021-05-02 14:51:28,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:28,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:28,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-02 14:51:28,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:29,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-02 14:51:29,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:29,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-02 14:51:29,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:29,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 17 [2021-05-02 14:51:29,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:29,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2021-05-02 14:51:29,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:29,014 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 14:51:29,014 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:29,015 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1082946972] [2021-05-02 14:51:29,015 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1082946972] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:51:29,015 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:51:29,015 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-02 14:51:29,016 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917057627] [2021-05-02 14:51:29,019 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-02 14:51:29,019 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:29,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-02 14:51:29,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:51:29,028 INFO L87 Difference]: Start difference. First operand has 39 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 23 states have internal predecessors, (30), 12 states have call successors, (12), 4 states have call predecessors, (12), 4 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) 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 14:51:29,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:29,143 INFO L93 Difference]: Finished difference Result 72 states and 112 transitions. [2021-05-02 14:51:29,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-02 14:51:29,144 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 14:51:29,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:29,149 INFO L225 Difference]: With dead ends: 72 [2021-05-02 14:51:29,150 INFO L226 Difference]: Without dead ends: 35 [2021-05-02 14:51:29,153 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 53.8ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-02 14:51:29,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-02 14:51:29,181 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2021-05-02 14:51:29,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 20 states have internal predecessors, (23), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 14:51:29,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 45 transitions. [2021-05-02 14:51:29,184 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 45 transitions. Word has length 32 [2021-05-02 14:51:29,184 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:29,184 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 45 transitions. [2021-05-02 14:51:29,184 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 14:51:29,184 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 45 transitions. [2021-05-02 14:51:29,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-05-02 14:51:29,185 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:29,185 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 14:51:29,186 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-02 14:51:29,186 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:29,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:29,186 INFO L82 PathProgramCache]: Analyzing trace with hash -1734391985, now seen corresponding path program 1 times [2021-05-02 14:51:29,186 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:29,187 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1724559898] [2021-05-02 14:51:29,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:29,198 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:29,199 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [638707591] [2021-05-02 14:51:29,199 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 14:51:29,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:29,275 INFO L263 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-02 14:51:29,279 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:29,318 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:29,330 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:29,336 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:29,423 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:29,442 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:29,463 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 14:51:29,463 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:29,463 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1724559898] [2021-05-02 14:51:29,464 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:29,464 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [638707591] [2021-05-02 14:51:29,464 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [638707591] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:51:29,464 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:51:29,464 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-02 14:51:29,464 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947967824] [2021-05-02 14:51:29,465 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-02 14:51:29,465 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:29,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-02 14:51:29,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 14:51:29,466 INFO L87 Difference]: Start difference. First operand 34 states and 45 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 14:51:29,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:29,488 INFO L93 Difference]: Finished difference Result 44 states and 56 transitions. [2021-05-02 14:51:29,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-02 14:51:29,488 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 14:51:29,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:29,489 INFO L225 Difference]: With dead ends: 44 [2021-05-02 14:51:29,489 INFO L226 Difference]: Without dead ends: 36 [2021-05-02 14:51:29,490 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 5.4ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-02 14:51:29,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-02 14:51:29,494 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-02 14:51:29,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 20 states have (on average 1.25) internal successors, (25), 21 states have internal predecessors, (25), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 14:51:29,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 47 transitions. [2021-05-02 14:51:29,496 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 47 transitions. Word has length 33 [2021-05-02 14:51:29,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:29,497 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 47 transitions. [2021-05-02 14:51:29,497 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 14:51:29,497 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 47 transitions. [2021-05-02 14:51:29,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-02 14:51:29,498 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:29,498 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, 1] [2021-05-02 14:51:29,698 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-02 14:51:29,699 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:29,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:29,699 INFO L82 PathProgramCache]: Analyzing trace with hash 2066454233, now seen corresponding path program 1 times [2021-05-02 14:51:29,699 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:29,699 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1384178731] [2021-05-02 14:51:29,699 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:29,709 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:29,709 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [603346083] [2021-05-02 14:51:29,709 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 14:51:29,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:29,762 INFO L263 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 14:51:29,763 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:29,814 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:29,835 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:29,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:29,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:29,851 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:29,876 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 14:51:29,877 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:29,877 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1384178731] [2021-05-02 14:51:29,877 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:29,877 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [603346083] [2021-05-02 14:51:29,877 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [603346083] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:29,877 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:29,877 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:51:29,877 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502972260] [2021-05-02 14:51:29,878 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:51:29,878 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:29,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:51:29,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:51:29,880 INFO L87 Difference]: Start difference. First operand 36 states and 47 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 14:51:29,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:29,960 INFO L93 Difference]: Finished difference Result 53 states and 71 transitions. [2021-05-02 14:51:29,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 14:51:29,960 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 34 [2021-05-02 14:51:29,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:29,966 INFO L225 Difference]: With dead ends: 53 [2021-05-02 14:51:29,966 INFO L226 Difference]: Without dead ends: 45 [2021-05-02 14:51:29,967 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 23.4ms TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:51:29,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-05-02 14:51:29,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 37. [2021-05-02 14:51:29,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 22 states have internal predecessors, (26), 12 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 14:51:29,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 48 transitions. [2021-05-02 14:51:29,985 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 48 transitions. Word has length 34 [2021-05-02 14:51:29,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:29,986 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 48 transitions. [2021-05-02 14:51:29,986 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 14:51:29,986 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 48 transitions. [2021-05-02 14:51:29,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-05-02 14:51:29,986 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:29,987 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, 1, 1, 1] [2021-05-02 14:51:30,196 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:30,197 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:30,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:30,197 INFO L82 PathProgramCache]: Analyzing trace with hash 1678606280, now seen corresponding path program 1 times [2021-05-02 14:51:30,198 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:30,198 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833349200] [2021-05-02 14:51:30,198 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:30,218 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:30,219 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [150820502] [2021-05-02 14:51:30,219 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 14:51:30,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:30,280 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 21 conjunts are in the unsatisfiable core [2021-05-02 14:51:30,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:30,314 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:30,331 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:30,338 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:30,340 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:30,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:30,349 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:30,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:30,394 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:30,411 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-05-02 14:51:30,411 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:30,411 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833349200] [2021-05-02 14:51:30,411 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:30,411 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [150820502] [2021-05-02 14:51:30,412 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [150820502] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:30,412 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:30,412 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-02 14:51:30,412 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256376094] [2021-05-02 14:51:30,412 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-02 14:51:30,412 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:30,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-02 14:51:30,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-02 14:51:30,413 INFO L87 Difference]: Start difference. First operand 37 states and 48 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 14:51:30,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:30,543 INFO L93 Difference]: Finished difference Result 59 states and 81 transitions. [2021-05-02 14:51:30,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-02 14:51:30,544 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 36 [2021-05-02 14:51:30,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:30,545 INFO L225 Difference]: With dead ends: 59 [2021-05-02 14:51:30,545 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 14:51:30,545 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 56.4ms TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-02 14:51:30,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 14:51:30,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 44. [2021-05-02 14:51:30,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 26 states have (on average 1.2307692307692308) internal successors, (32), 28 states have internal predecessors, (32), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 14:51:30,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 56 transitions. [2021-05-02 14:51:30,551 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 56 transitions. Word has length 36 [2021-05-02 14:51:30,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:30,551 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 56 transitions. [2021-05-02 14:51:30,551 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 3 states have call successors, (7), 2 states have call predecessors, (7), 2 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2021-05-02 14:51:30,551 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 56 transitions. [2021-05-02 14:51:30,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-05-02 14:51:30,552 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:30,552 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 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] [2021-05-02 14:51:30,760 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:30,761 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:30,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:30,762 INFO L82 PathProgramCache]: Analyzing trace with hash -2124209112, now seen corresponding path program 1 times [2021-05-02 14:51:30,762 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:30,762 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [93211105] [2021-05-02 14:51:30,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:30,774 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:30,774 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1859551664] [2021-05-02 14:51:30,774 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 [2021-05-02 14:51:30,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:30,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-02 14:51:30,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:30,837 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:30,844 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:30,847 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:30,883 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:30,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:30,886 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:30,905 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:30,906 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:30,917 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-05-02 14:51:30,917 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:30,917 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [93211105] [2021-05-02 14:51:30,917 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:30,917 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1859551664] [2021-05-02 14:51:30,917 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1859551664] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-02 14:51:30,918 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-02 14:51:30,918 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-02 14:51:30,918 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740720152] [2021-05-02 14:51:30,918 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-02 14:51:30,918 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:30,918 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-02 14:51:30,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:51:30,919 INFO L87 Difference]: Start difference. First operand 44 states and 56 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 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 14:51:30,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:30,955 INFO L93 Difference]: Finished difference Result 63 states and 83 transitions. [2021-05-02 14:51:30,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-02 14:51:30,956 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 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 39 [2021-05-02 14:51:30,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:30,957 INFO L225 Difference]: With dead ends: 63 [2021-05-02 14:51:30,957 INFO L226 Difference]: Without dead ends: 44 [2021-05-02 14:51:30,958 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 6.8ms TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-02 14:51:30,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2021-05-02 14:51:30,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2021-05-02 14:51:30,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 26 states have (on average 1.1923076923076923) internal successors, (31), 28 states have internal predecessors, (31), 13 states have call successors, (13), 5 states have call predecessors, (13), 4 states have return successors, (11), 10 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-02 14:51:30,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 55 transitions. [2021-05-02 14:51:30,962 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 55 transitions. Word has length 39 [2021-05-02 14:51:30,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:30,963 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 55 transitions. [2021-05-02 14:51:30,963 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 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 14:51:30,963 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 55 transitions. [2021-05-02 14:51:30,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-05-02 14:51:30,963 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:30,963 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 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] [2021-05-02 14:51:31,172 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:31,173 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:31,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:31,174 INFO L82 PathProgramCache]: Analyzing trace with hash 1052701339, now seen corresponding path program 1 times [2021-05-02 14:51:31,174 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:31,174 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [863004851] [2021-05-02 14:51:31,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:31,185 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:31,185 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1312194952] [2021-05-02 14:51:31,185 INFO L95 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 [2021-05-02 14:51:31,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:31,321 INFO L263 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 14:51:31,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:31,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,348 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,367 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,368 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,377 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,380 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,404 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,406 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,417 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,419 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,436 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-05-02 14:51:31,436 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:31,436 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [863004851] [2021-05-02 14:51:31,436 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:31,437 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1312194952] [2021-05-02 14:51:31,437 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1312194952] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:31,437 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:31,437 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 14:51:31,437 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [350694043] [2021-05-02 14:51:31,437 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 14:51:31,437 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:31,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 14:51:31,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:51:31,438 INFO L87 Difference]: Start difference. First operand 44 states and 55 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 14:51:31,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:31,514 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2021-05-02 14:51:31,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 14:51:31,515 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) Word has length 41 [2021-05-02 14:51:31,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:31,515 INFO L225 Difference]: With dead ends: 58 [2021-05-02 14:51:31,516 INFO L226 Difference]: Without dead ends: 56 [2021-05-02 14:51:31,516 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 33.8ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:51:31,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-05-02 14:51:31,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2021-05-02 14:51:31,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 32 states have (on average 1.21875) internal successors, (39), 34 states have internal predecessors, (39), 17 states have call successors, (17), 6 states have call predecessors, (17), 5 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-02 14:51:31,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 71 transitions. [2021-05-02 14:51:31,521 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 71 transitions. Word has length 41 [2021-05-02 14:51:31,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:31,522 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 71 transitions. [2021-05-02 14:51:31,522 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (6), 3 states have call predecessors, (6), 3 states have call successors, (6) [2021-05-02 14:51:31,522 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 71 transitions. [2021-05-02 14:51:31,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-05-02 14:51:31,522 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:31,522 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 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] [2021-05-02 14:51:31,724 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-02 14:51:31,724 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:31,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:31,725 INFO L82 PathProgramCache]: Analyzing trace with hash 1531994984, now seen corresponding path program 1 times [2021-05-02 14:51:31,725 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:31,725 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [107352293] [2021-05-02 14:51:31,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:31,732 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:31,732 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [863496419] [2021-05-02 14:51:31,733 INFO L95 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 [2021-05-02 14:51:31,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:31,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 17 conjunts are in the unsatisfiable core [2021-05-02 14:51:31,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:31,803 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,805 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,821 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,823 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,832 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,834 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,857 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,858 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,865 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,868 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,879 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,885 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:31,901 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 4 proven. 9 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2021-05-02 14:51:31,901 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:31,901 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [107352293] [2021-05-02 14:51:31,902 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:31,902 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [863496419] [2021-05-02 14:51:31,902 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [863496419] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:31,902 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:31,902 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2021-05-02 14:51:31,902 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [873620823] [2021-05-02 14:51:31,902 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-02 14:51:31,902 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:31,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-02 14:51:31,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-02 14:51:31,903 INFO L87 Difference]: Start difference. First operand 55 states and 71 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 14:51:32,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:32,014 INFO L93 Difference]: Finished difference Result 62 states and 77 transitions. [2021-05-02 14:51:32,015 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-02 14:51:32,015 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) Word has length 46 [2021-05-02 14:51:32,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:32,016 INFO L225 Difference]: With dead ends: 62 [2021-05-02 14:51:32,016 INFO L226 Difference]: Without dead ends: 60 [2021-05-02 14:51:32,016 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 32.3ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:51:32,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2021-05-02 14:51:32,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2021-05-02 14:51:32,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 35 states have (on average 1.2) internal successors, (42), 37 states have internal predecessors, (42), 17 states have call successors, (17), 7 states have call predecessors, (17), 6 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-02 14:51:32,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 74 transitions. [2021-05-02 14:51:32,022 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 74 transitions. Word has length 46 [2021-05-02 14:51:32,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:32,022 INFO L480 AbstractCegarLoop]: Abstraction has 59 states and 74 transitions. [2021-05-02 14:51:32,022 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (7), 3 states have call predecessors, (7), 3 states have call successors, (7) [2021-05-02 14:51:32,022 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 74 transitions. [2021-05-02 14:51:32,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-05-02 14:51:32,023 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:32,023 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 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] [2021-05-02 14:51:32,240 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:32,241 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:32,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:32,241 INFO L82 PathProgramCache]: Analyzing trace with hash -300711301, now seen corresponding path program 1 times [2021-05-02 14:51:32,241 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:32,241 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1466947767] [2021-05-02 14:51:32,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:32,249 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:32,249 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [237674769] [2021-05-02 14:51:32,249 INFO L95 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 [2021-05-02 14:51:32,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:32,317 INFO L263 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 26 conjunts are in the unsatisfiable core [2021-05-02 14:51:32,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:32,345 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:32,346 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:32,376 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:32,378 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:32,392 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:32,393 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:32,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:32,427 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:32,441 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:32,443 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:32,451 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:32,452 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:32,478 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:32,479 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:32,497 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 11 proven. 10 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-05-02 14:51:32,497 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:32,497 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1466947767] [2021-05-02 14:51:32,497 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:32,497 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [237674769] [2021-05-02 14:51:32,497 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [237674769] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:32,497 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:32,498 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2021-05-02 14:51:32,498 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418434777] [2021-05-02 14:51:32,498 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-02 14:51:32,498 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:32,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-02 14:51:32,498 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-02 14:51:32,499 INFO L87 Difference]: Start difference. First operand 59 states and 74 transitions. Second operand has 10 states, 10 states have (on average 2.4) internal successors, (24), 8 states have internal predecessors, (24), 3 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 14:51:34,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:34,701 INFO L93 Difference]: Finished difference Result 66 states and 80 transitions. [2021-05-02 14:51:34,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-02 14:51:34,701 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 8 states have internal predecessors, (24), 3 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 51 [2021-05-02 14:51:34,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:34,702 INFO L225 Difference]: With dead ends: 66 [2021-05-02 14:51:34,702 INFO L226 Difference]: Without dead ends: 64 [2021-05-02 14:51:34,702 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 41 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 70.6ms TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-02 14:51:34,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-05-02 14:51:34,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2021-05-02 14:51:34,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 40 states have internal predecessors, (45), 17 states have call successors, (17), 8 states have call predecessors, (17), 7 states have return successors, (15), 14 states have call predecessors, (15), 15 states have call successors, (15) [2021-05-02 14:51:34,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 77 transitions. [2021-05-02 14:51:34,708 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 77 transitions. Word has length 51 [2021-05-02 14:51:34,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:34,709 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 77 transitions. [2021-05-02 14:51:34,709 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 2.4) internal successors, (24), 8 states have internal predecessors, (24), 3 states have call successors, (10), 2 states have call predecessors, (10), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-02 14:51:34,709 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 77 transitions. [2021-05-02 14:51:34,709 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-05-02 14:51:34,709 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:34,709 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 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] [2021-05-02 14:51:34,924 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:34,925 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:34,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:34,925 INFO L82 PathProgramCache]: Analyzing trace with hash -2044027516, now seen corresponding path program 1 times [2021-05-02 14:51:34,925 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:34,925 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [983399489] [2021-05-02 14:51:34,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:34,932 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:34,932 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1729844466] [2021-05-02 14:51:34,933 INFO L95 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 [2021-05-02 14:51:35,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-02 14:51:35,026 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 9 conjunts are in the unsatisfiable core [2021-05-02 14:51:35,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-02 14:51:35,045 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:35,052 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:35,053 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:35,085 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:35,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:35,087 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:35,095 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:35,096 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:35,097 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:35,127 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:35,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-02 14:51:35,136 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2021-05-02 14:51:35,137 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-02 14:51:35,137 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [983399489] [2021-05-02 14:51:35,137 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-02 14:51:35,137 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1729844466] [2021-05-02 14:51:35,137 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1729844466] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-02 14:51:35,137 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-02 14:51:35,137 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2021-05-02 14:51:35,137 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [896217717] [2021-05-02 14:51:35,137 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-02 14:51:35,138 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-02 14:51:35,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-02 14:51:35,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-05-02 14:51:35,138 INFO L87 Difference]: Start difference. First operand 63 states and 77 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 4 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-02 14:51:35,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-02 14:51:35,200 INFO L93 Difference]: Finished difference Result 95 states and 114 transitions. [2021-05-02 14:51:35,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-02 14:51:35,200 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 4 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) Word has length 59 [2021-05-02 14:51:35,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-02 14:51:35,201 INFO L225 Difference]: With dead ends: 95 [2021-05-02 14:51:35,201 INFO L226 Difference]: Without dead ends: 57 [2021-05-02 14:51:35,202 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 14.6ms TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2021-05-02 14:51:35,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-05-02 14:51:35,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 55. [2021-05-02 14:51:35,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 35 states have (on average 1.1142857142857143) internal successors, (39), 36 states have internal predecessors, (39), 12 states have call successors, (12), 8 states have call predecessors, (12), 7 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-02 14:51:35,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 61 transitions. [2021-05-02 14:51:35,207 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 61 transitions. Word has length 59 [2021-05-02 14:51:35,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-02 14:51:35,207 INFO L480 AbstractCegarLoop]: Abstraction has 55 states and 61 transitions. [2021-05-02 14:51:35,207 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 5 states have internal predecessors, (21), 4 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-02 14:51:35,207 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 61 transitions. [2021-05-02 14:51:35,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-02 14:51:35,208 INFO L515 BasicCegarLoop]: Found error trace [2021-05-02 14:51:35,208 INFO L523 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 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] [2021-05-02 14:51:35,424 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-05-02 14:51:35,425 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-02 14:51:35,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-02 14:51:35,425 INFO L82 PathProgramCache]: Analyzing trace with hash 35160305, now seen corresponding path program 1 times [2021-05-02 14:51:35,425 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-02 14:51:35,425 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [926216261] [2021-05-02 14:51:35,426 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-02 14:51:35,433 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-02 14:51:35,434 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [663520904] [2021-05-02 14:51:35,434 INFO L95 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 [2021-05-02 14:51:35,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 14:51:35,536 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 14:51:35,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-05-02 14:51:35,555 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-05-02 14:51:35,598 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-05-02 14:51:35,598 INFO L624 BasicCegarLoop]: Counterexample might be feasible [2021-05-02 14:51:35,798 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-02 14:51:35,857 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 02.05 02:51:35 BoogieIcfgContainer [2021-05-02 14:51:35,857 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-02 14:51:35,858 INFO L168 Benchmark]: Toolchain (without parser) took 7759.23 ms. Allocated memory was 184.5 MB in the beginning and 222.3 MB in the end (delta: 37.7 MB). Free memory was 148.9 MB in the beginning and 173.4 MB in the end (delta: -24.4 MB). Peak memory consumption was 14.5 MB. Max. memory is 8.0 GB. [2021-05-02 14:51:35,858 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 184.5 MB. Free memory was 166.0 MB in the beginning and 165.9 MB in the end (delta: 105.1 kB). There was no memory consumed. Max. memory is 8.0 GB. [2021-05-02 14:51:35,858 INFO L168 Benchmark]: CACSL2BoogieTranslator took 178.91 ms. Allocated memory is still 184.5 MB. Free memory was 148.7 MB in the beginning and 167.1 MB in the end (delta: -18.4 MB). Peak memory consumption was 13.0 MB. Max. memory is 8.0 GB. [2021-05-02 14:51:35,858 INFO L168 Benchmark]: Boogie Preprocessor took 20.22 ms. Allocated memory is still 184.5 MB. Free memory was 167.1 MB in the beginning and 165.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-05-02 14:51:35,858 INFO L168 Benchmark]: RCFGBuilder took 391.06 ms. Allocated memory is still 184.5 MB. Free memory was 165.3 MB in the beginning and 148.5 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. [2021-05-02 14:51:35,858 INFO L168 Benchmark]: TraceAbstraction took 7165.50 ms. Allocated memory was 184.5 MB in the beginning and 222.3 MB in the end (delta: 37.7 MB). Free memory was 147.8 MB in the beginning and 173.4 MB in the end (delta: -25.5 MB). Peak memory consumption was 13.1 MB. Max. memory is 8.0 GB. [2021-05-02 14:51:35,858 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 184.5 MB. Free memory was 166.0 MB in the beginning and 165.9 MB in the end (delta: 105.1 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 178.91 ms. Allocated memory is still 184.5 MB. Free memory was 148.7 MB in the beginning and 167.1 MB in the end (delta: -18.4 MB). Peak memory consumption was 13.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 20.22 ms. Allocated memory is still 184.5 MB. Free memory was 167.1 MB in the beginning and 165.7 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 391.06 ms. Allocated memory is still 184.5 MB. Free memory was 165.3 MB in the beginning and 148.5 MB in the end (delta: 16.8 MB). Peak memory consumption was 16.8 MB. Max. memory is 8.0 GB. * TraceAbstraction took 7165.50 ms. Allocated memory was 184.5 MB in the beginning and 222.3 MB in the end (delta: 37.7 MB). Free memory was 147.8 MB in the beginning and 173.4 MB in the end (delta: -25.5 MB). Peak memory consumption was 13.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L18] int counter = 0; VAL [\old(counter)=17, counter=0] [L20] int x, y; [L21] long long a, b, p, q, r, s, c, k, xy, yy; [L22] x = __VERIFIER_nondet_int() [L23] y = __VERIFIER_nondet_int() [L24] CALL assume_abort_if_not(x >= 1) VAL [\old(cond)=1, \old(counter)=0, counter=0] [L8] COND FALSE !(!cond) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=0] [L24] RET assume_abort_if_not(x >= 1) VAL [\old(counter)=0, counter=0, x=1, y=2] [L25] CALL assume_abort_if_not(y >= 1) VAL [\old(cond)=1, \old(counter)=0, counter=0] [L8] COND FALSE !(!cond) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=0] [L25] RET assume_abort_if_not(y >= 1) VAL [\old(counter)=0, counter=0, x=1, y=2] [L27] a = x [L28] b = y [L29] p = 1 [L30] q = 0 [L31] r = 0 [L32] s = 1 [L33] c = 0 [L34] k = 0 [L35] xy = (long long) x * y [L36] yy = (long long) y * y VAL [\old(counter)=0, a=1, b=2, c=0, counter=0, k=0, p=1, q=0, r=0, s=1, x=1, xy=2, y=2, yy=4] [L37] CALL assume_abort_if_not(xy < 2147483647) VAL [\old(cond)=1, \old(counter)=0, counter=0] [L8] COND FALSE !(!cond) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=0] [L37] RET assume_abort_if_not(xy < 2147483647) VAL [\old(counter)=0, a=1, b=2, c=0, counter=0, k=0, p=1, q=0, r=0, s=1, x=1, xy=2, y=2, yy=4] [L38] CALL assume_abort_if_not(yy < 2147483647) VAL [\old(cond)=1, \old(counter)=0, counter=0] [L8] COND FALSE !(!cond) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=0] [L38] RET assume_abort_if_not(yy < 2147483647) VAL [\old(counter)=0, a=1, b=2, c=0, counter=0, k=0, p=1, q=0, r=0, s=1, x=1, xy=2, y=2, yy=4] [L40] EXPR counter++ VAL [\old(counter)=0, a=1, b=2, c=0, counter=1, counter++=0, k=0, p=1, q=0, r=0, s=1, x=1, xy=2, y=2, yy=4] [L40] COND TRUE counter++<2 [L41] COND FALSE !(!(b != 0)) [L43] c = a [L44] k = 0 VAL [\old(counter)=0, a=1, b=2, c=1, counter=1, k=0, p=1, q=0, r=0, s=1, x=1, xy=2, y=2, yy=4] [L46] EXPR counter++ VAL [\old(counter)=0, a=1, b=2, c=1, counter=2, counter++=1, k=0, p=1, q=0, r=0, s=1, x=1, xy=2, y=2, yy=4] [L46] COND TRUE counter++<2 [L47] CALL __VERIFIER_assert(a == k * b + c) VAL [\old(cond)=1, \old(counter)=0, counter=2] [L11] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=2] [L47] RET __VERIFIER_assert(a == k * b + c) VAL [\old(counter)=0, a=1, b=2, c=1, counter=2, k=0, p=1, q=0, r=0, s=1, x=1, xy=2, y=2, yy=4] [L48] CALL __VERIFIER_assert(a == y*r + x*p) VAL [\old(cond)=1, \old(counter)=0, counter=2] [L11] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=2] [L48] RET __VERIFIER_assert(a == y*r + x*p) VAL [\old(counter)=0, a=1, b=2, c=1, counter=2, k=0, p=1, q=0, r=0, s=1, x=1, xy=2, y=2, yy=4] [L49] CALL __VERIFIER_assert(b == x * q + y * s) VAL [\old(cond)=1, \old(counter)=0, counter=2] [L11] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=2] [L49] RET __VERIFIER_assert(b == x * q + y * s) VAL [\old(counter)=0, a=1, b=2, c=1, counter=2, k=0, p=1, q=0, r=0, s=1, x=1, xy=2, y=2, yy=4] [L50] CALL __VERIFIER_assert(q*xy + s*yy - q*x - b*y - s*y + b == 0) VAL [\old(cond)=1, \old(counter)=0, counter=2] [L11] COND FALSE !(!(cond)) VAL [\old(cond)=1, \old(counter)=0, cond=1, counter=2] [L50] RET __VERIFIER_assert(q*xy + s*yy - q*x - b*y - s*y + b == 0) VAL [\old(counter)=0, a=1, b=2, c=1, counter=2, k=0, p=1, q=0, r=0, s=1, x=1, xy=2, y=2, yy=4] [L51] COND TRUE !(c >= b) VAL [\old(counter)=0, a=1, b=2, c=1, counter=2, k=0, p=1, q=0, r=0, s=1, x=1, xy=2, y=2, yy=4] [L57] a = b [L58] b = c [L60] long long temp; [L61] temp = p [L62] p = q [L63] q = temp - q * k [L64] temp = r [L65] r = s [L66] s = temp - s * k VAL [\old(counter)=0, a=2, b=1, c=1, counter=2, k=0, p=0, q=1, r=1, s=0, temp=0, x=1, xy=2, y=2, yy=4] [L40] EXPR counter++ VAL [\old(counter)=0, a=2, b=1, c=1, counter=3, counter++=2, k=0, p=0, q=1, r=1, s=0, temp=0, x=1, xy=2, y=2, yy=4] [L40] COND FALSE !(counter++<2) [L70] CALL __VERIFIER_assert(q*x + s*y == 0) VAL [\old(cond)=0, \old(counter)=0, counter=3] [L11] COND TRUE !(cond) VAL [\old(cond)=0, \old(counter)=0, cond=0, counter=3] [L13] reach_error() VAL [\old(cond)=0, \old(counter)=0, cond=0, counter=3] - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 42 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 7055.4ms, OverallIterations: 10, TraceHistogramMax: 5, EmptinessCheckTime: 14.2ms, AutomataDifference: 2879.5ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 9.8ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 361 SDtfs, 191 SDslu, 1034 SDs, 0 SdLazy, 605 SolverSat, 91 SolverUnsat, 1 SolverUnknown, 0 SolverNotchecked, 2474.5ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 361 GetRequests, 305 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 297.4ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=63occurred in iteration=8, InterpolantAutomatonStates: 59, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 76.9ms AutomataMinimizationTime, 9 MinimizatonAttempts, 27 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 164.7ms SsaConstructionTime, 252.9ms SatisfiabilityAnalysisTime, 1212.7ms InterpolantComputationTime, 431 NumberOfCodeBlocks, 431 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 362 ConstructedInterpolants, 0 QuantifiedInterpolants, 1165 SizeOfPredicates, 20 NumberOfNonLiveVariables, 1453 ConjunctsInSsa, 109 ConjunctsInUnsatCore, 9 InterpolantComputations, 3 PerfectInterpolantSequences, 234/281 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...