/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/cohendiv-ll_unwindbound1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 01:34:46,327 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 01:34:46,329 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 01:34:46,369 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 01:34:46,390 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-06 01:34:46,391 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-06 01:34:46,392 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-06 01:34:46,394 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-06 01:34:46,396 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-06 01:34:46,398 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-06 01:34:46,400 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-06 01:34:46,405 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-06 01:34:46,407 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-06 01:34:46,408 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-06 01:34:46,408 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-06 01:34:46,410 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-06 01:34:46,419 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-06 01:34:46,427 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 01:34:46,428 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 01:34:46,428 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 01:34:46,432 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 [2021-05-06 01:34:46,462 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 01:34:46,462 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 01:34:46,465 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-05-06 01:34:46,465 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-05-06 01:34:46,465 INFO L138 SettingsManager]: * Use SBE=true [2021-05-06 01:34:46,465 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 01:34:46,466 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 01:34:46,466 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 01:34:46,466 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 01:34:46,466 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 01:34:46,467 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 01:34:46,467 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 01:34:46,467 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 01:34:46,467 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 01:34:46,468 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 01:34:46,468 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 01:34:46,468 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 01:34:46,468 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 01:34:46,468 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 01:34:46,468 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 01:34:46,469 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 01:34:46,469 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 01:34:46,469 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-05-06 01:34:46,469 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-05-06 01:34:46,470 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 01:34:46,470 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-05-06 01:34:46,470 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-06 01:34:46,470 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-05-06 01:34:46,470 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 01:34:46,809 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 01:34:46,827 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 01:34:46,829 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 01:34:46,830 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 01:34:46,831 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 01:34:46,832 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench-scaling/cohendiv-ll_unwindbound1.c [2021-05-06 01:34:46,889 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aaf38e5a3/fb8ce102ef764aa4b7de0922b7b20d94/FLAG53b7e39f9 [2021-05-06 01:34:47,286 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 01:34:47,287 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench-scaling/cohendiv-ll_unwindbound1.c [2021-05-06 01:34:47,293 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aaf38e5a3/fb8ce102ef764aa4b7de0922b7b20d94/FLAG53b7e39f9 [2021-05-06 01:34:47,675 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/aaf38e5a3/fb8ce102ef764aa4b7de0922b7b20d94 [2021-05-06 01:34:47,678 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 01:34:47,679 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-06 01:34:47,680 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 01:34:47,680 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 01:34:47,692 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 01:34:47,693 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 01:34:47" (1/1) ... [2021-05-06 01:34:47,694 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@36d1028 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:34:47, skipping insertion in model container [2021-05-06 01:34:47,694 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 01:34:47" (1/1) ... [2021-05-06 01:34:47,703 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 01:34:47,717 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 01:34:47,823 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/cohendiv-ll_unwindbound1.c[576,589] [2021-05-06 01:34:47,835 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 01:34:47,841 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 01:34:47,851 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/cohendiv-ll_unwindbound1.c[576,589] [2021-05-06 01:34:47,856 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 01:34:47,867 INFO L208 MainTranslator]: Completed translation [2021-05-06 01:34:47,867 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:34:47 WrapperNode [2021-05-06 01:34:47,867 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 01:34:47,868 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 01:34:47,868 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 01:34:47,869 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 01:34:47,883 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:34:47" (1/1) ... [2021-05-06 01:34:47,884 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:34:47" (1/1) ... [2021-05-06 01:34:47,890 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:34:47" (1/1) ... [2021-05-06 01:34:47,890 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:34:47" (1/1) ... [2021-05-06 01:34:47,910 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:34:47" (1/1) ... [2021-05-06 01:34:47,923 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:34:47" (1/1) ... [2021-05-06 01:34:47,924 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:34:47" (1/1) ... [2021-05-06 01:34:47,925 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 01:34:47,928 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 01:34:47,928 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 01:34:47,929 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 01:34:47,929 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:34:47" (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 [2021-05-06 01:34:48,010 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 01:34:48,011 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 01:34:48,011 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 01:34:48,012 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 01:34:48,012 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 01:34:48,012 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 01:34:48,012 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 01:34:48,013 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 01:34:48,013 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 01:34:48,013 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 01:34:48,014 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-06 01:34:48,014 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 01:34:48,015 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 01:34:48,015 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 01:34:48,016 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 01:34:48,016 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 01:34:48,016 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 01:34:48,017 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 01:34:48,017 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 01:34:48,017 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 01:34:48,292 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 01:34:48,292 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 01:34:48,293 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 01:34:48 BoogieIcfgContainer [2021-05-06 01:34:48,294 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 01:34:48,295 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 01:34:48,295 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 01:34:48,297 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 01:34:48,297 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 01:34:47" (1/3) ... [2021-05-06 01:34:48,298 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@70707a8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 01:34:48, skipping insertion in model container [2021-05-06 01:34:48,298 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 01:34:47" (2/3) ... [2021-05-06 01:34:48,298 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@70707a8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 01:34:48, skipping insertion in model container [2021-05-06 01:34:48,298 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 01:34:48" (3/3) ... [2021-05-06 01:34:48,299 INFO L111 eAbstractionObserver]: Analyzing ICFG cohendiv-ll_unwindbound1.c [2021-05-06 01:34:48,303 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-05-06 01:34:48,306 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 01:34:48,330 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 01:34:48,348 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 01:34:48,348 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-06 01:34:48,348 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-05-06 01:34:48,348 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 01:34:48,348 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 01:34:48,348 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 01:34:48,348 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 01:34:48,349 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 01:34:48,362 INFO L276 IsEmpty]: Start isEmpty. Operand has 38 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 23 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) [2021-05-06 01:34:48,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 01:34:48,365 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 01:34:48,366 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 01:34:48,366 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 01:34:48,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 01:34:48,371 INFO L82 PathProgramCache]: Analyzing trace with hash -1588022502, now seen corresponding path program 1 times [2021-05-06 01:34:48,377 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 01:34:48,377 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1399791930] [2021-05-06 01:34:48,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 01:34:48,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:34:48,608 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 01:34:48,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:34:48,633 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 01:34:48,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:34:48,639 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 01:34:48,639 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 01:34:48,640 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1399791930] [2021-05-06 01:34:48,640 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1399791930] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 01:34:48,640 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 01:34:48,641 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 01:34:48,641 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230161021] [2021-05-06 01:34:48,645 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 01:34:48,645 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 01:34:48,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 01:34:48,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 01:34:48,657 INFO L87 Difference]: Start difference. First operand has 38 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 23 states have internal predecessors, (31), 10 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (10), 10 states have call predecessors, (10), 10 states have call successors, (10) 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, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 01:34:48,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 01:34:48,818 INFO L93 Difference]: Finished difference Result 68 states and 101 transitions. [2021-05-06 01:34:48,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 01:34:48,820 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, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2021-05-06 01:34:48,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 01:34:48,827 INFO L225 Difference]: With dead ends: 68 [2021-05-06 01:34:48,827 INFO L226 Difference]: Without dead ends: 34 [2021-05-06 01:34:48,831 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 56.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 01:34:48,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-06 01:34:48,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-05-06 01:34:48,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 19 states have (on average 1.263157894736842) internal successors, (24), 20 states have internal predecessors, (24), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 01:34:48,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 42 transitions. [2021-05-06 01:34:48,904 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 42 transitions. Word has length 17 [2021-05-06 01:34:48,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 01:34:48,904 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 42 transitions. [2021-05-06 01:34:48,904 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, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 01:34:48,904 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 42 transitions. [2021-05-06 01:34:48,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 01:34:48,905 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 01:34:48,905 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 01:34:48,905 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 01:34:48,905 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 01:34:48,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 01:34:48,906 INFO L82 PathProgramCache]: Analyzing trace with hash 766070672, now seen corresponding path program 1 times [2021-05-06 01:34:48,906 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 01:34:48,907 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [806651181] [2021-05-06 01:34:48,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 01:34:48,924 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 01:34:48,925 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1299952724] [2021-05-06 01:34:48,925 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 [2021-05-06 01:34:48,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:34:48,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-06 01:34:48,991 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 01:34:49,042 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:49,047 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:49,049 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:49,078 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:49,081 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:49,106 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 01:34:49,106 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 01:34:49,106 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [806651181] [2021-05-06 01:34:49,107 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 01:34:49,107 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1299952724] [2021-05-06 01:34:49,107 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1299952724] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 01:34:49,107 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 01:34:49,107 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 01:34:49,107 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316807975] [2021-05-06 01:34:49,108 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 01:34:49,108 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 01:34:49,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 01:34:49,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 01:34:49,110 INFO L87 Difference]: Start difference. First operand 33 states and 42 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, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 01:34:49,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 01:34:49,125 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2021-05-06 01:34:49,126 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 01:34:49,126 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, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 18 [2021-05-06 01:34:49,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 01:34:49,127 INFO L225 Difference]: With dead ends: 42 [2021-05-06 01:34:49,127 INFO L226 Difference]: Without dead ends: 35 [2021-05-06 01:34:49,128 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.1ms TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 01:34:49,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-06 01:34:49,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-06 01:34:49,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 22 states have internal predecessors, (26), 10 states have call successors, (10), 4 states have call predecessors, (10), 3 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 01:34:49,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 44 transitions. [2021-05-06 01:34:49,136 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 44 transitions. Word has length 18 [2021-05-06 01:34:49,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 01:34:49,136 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 44 transitions. [2021-05-06 01:34:49,136 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, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 01:34:49,136 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 44 transitions. [2021-05-06 01:34:49,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-05-06 01:34:49,137 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 01:34:49,137 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 01:34:49,337 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-06 01:34:49,338 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 01:34:49,338 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 01:34:49,338 INFO L82 PathProgramCache]: Analyzing trace with hash 767560222, now seen corresponding path program 1 times [2021-05-06 01:34:49,339 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 01:34:49,339 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1342415778] [2021-05-06 01:34:49,339 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 01:34:49,355 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 01:34:49,355 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1666755199] [2021-05-06 01:34:49,355 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 [2021-05-06 01:34:49,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:34:49,418 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-06 01:34:49,419 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 01:34:49,525 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:49,527 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:49,549 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:49,572 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 01:34:49,573 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 01:34:49,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1342415778] [2021-05-06 01:34:49,573 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 01:34:49,573 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1666755199] [2021-05-06 01:34:49,573 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1666755199] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 01:34:49,573 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 01:34:49,574 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 01:34:49,574 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1063560519] [2021-05-06 01:34:49,574 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 01:34:49,574 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 01:34:49,576 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 01:34:49,577 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-06 01:34:49,577 INFO L87 Difference]: Start difference. First operand 35 states and 44 transitions. Second operand has 8 states, 8 states have (on average 1.5) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 01:34:49,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 01:34:49,689 INFO L93 Difference]: Finished difference Result 45 states and 56 transitions. [2021-05-06 01:34:49,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 01:34:49,690 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.5) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 18 [2021-05-06 01:34:49,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 01:34:49,693 INFO L225 Difference]: With dead ends: 45 [2021-05-06 01:34:49,693 INFO L226 Difference]: Without dead ends: 43 [2021-05-06 01:34:49,695 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 64.0ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-06 01:34:49,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-05-06 01:34:49,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2021-05-06 01:34:49,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 24 states have (on average 1.2083333333333333) internal successors, (29), 26 states have internal predecessors, (29), 11 states have call successors, (11), 5 states have call predecessors, (11), 4 states have return successors, (9), 8 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-06 01:34:49,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 49 transitions. [2021-05-06 01:34:49,717 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 49 transitions. Word has length 18 [2021-05-06 01:34:49,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 01:34:49,717 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 49 transitions. [2021-05-06 01:34:49,717 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.5) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-05-06 01:34:49,718 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 49 transitions. [2021-05-06 01:34:49,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 01:34:49,718 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 01:34:49,718 INFO L523 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 01:34:49,919 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 01:34:49,919 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 01:34:49,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 01:34:49,920 INFO L82 PathProgramCache]: Analyzing trace with hash -1016228092, now seen corresponding path program 1 times [2021-05-06 01:34:49,920 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 01:34:49,920 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1464538335] [2021-05-06 01:34:49,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 01:34:49,931 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 01:34:49,932 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1403173268] [2021-05-06 01:34:49,932 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 [2021-05-06 01:34:49,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:34:49,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 12 conjunts are in the unsatisfiable core [2021-05-06 01:34:49,992 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 01:34:50,106 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:50,109 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:50,128 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:50,133 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:50,146 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:50,160 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 01:34:50,160 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 01:34:50,161 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1464538335] [2021-05-06 01:34:50,161 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 01:34:50,161 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1403173268] [2021-05-06 01:34:50,161 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1403173268] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 01:34:50,161 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 01:34:50,161 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-06 01:34:50,161 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1145436231] [2021-05-06 01:34:50,162 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-06 01:34:50,162 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 01:34:50,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-06 01:34:50,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-05-06 01:34:50,164 INFO L87 Difference]: Start difference. First operand 40 states and 49 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 01:34:50,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 01:34:50,271 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2021-05-06 01:34:50,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 01:34:50,272 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-06 01:34:50,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 01:34:50,273 INFO L225 Difference]: With dead ends: 58 [2021-05-06 01:34:50,273 INFO L226 Difference]: Without dead ends: 55 [2021-05-06 01:34:50,273 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 62.6ms TimeCoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2021-05-06 01:34:50,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-06 01:34:50,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2021-05-06 01:34:50,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 32 states have (on average 1.21875) internal successors, (39), 33 states have internal predecessors, (39), 16 states have call successors, (16), 6 states have call predecessors, (16), 5 states have return successors, (14), 14 states have call predecessors, (14), 14 states have call successors, (14) [2021-05-06 01:34:50,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 69 transitions. [2021-05-06 01:34:50,283 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 69 transitions. Word has length 23 [2021-05-06 01:34:50,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 01:34:50,283 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 69 transitions. [2021-05-06 01:34:50,283 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 01:34:50,283 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 69 transitions. [2021-05-06 01:34:50,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-05-06 01:34:50,284 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 01:34:50,284 INFO L523 BasicCegarLoop]: trace histogram [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] [2021-05-06 01:34:50,507 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 01:34:50,508 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 01:34:50,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 01:34:50,508 INFO L82 PathProgramCache]: Analyzing trace with hash 2019703110, now seen corresponding path program 1 times [2021-05-06 01:34:50,508 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 01:34:50,508 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1443549253] [2021-05-06 01:34:50,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 01:34:50,520 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 01:34:50,520 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [826904371] [2021-05-06 01:34:50,521 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 [2021-05-06 01:34:50,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:34:50,593 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 01:34:50,595 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 01:34:50,615 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:50,617 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:50,618 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:50,634 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:50,638 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:50,639 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:50,666 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:50,669 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:50,686 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 01:34:50,687 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 01:34:50,687 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1443549253] [2021-05-06 01:34:50,687 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 01:34:50,687 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [826904371] [2021-05-06 01:34:50,687 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [826904371] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 01:34:50,687 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 01:34:50,687 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 01:34:50,687 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945204243] [2021-05-06 01:34:50,688 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 01:34:50,688 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 01:34:50,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 01:34:50,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-05-06 01:34:50,689 INFO L87 Difference]: Start difference. First operand 54 states and 69 transitions. Second operand has 5 states, 5 states have (on average 3.6) internal successors, (18), 4 states have internal predecessors, (18), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-06 01:34:50,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 01:34:50,735 INFO L93 Difference]: Finished difference Result 75 states and 94 transitions. [2021-05-06 01:34:50,736 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 01:34:50,736 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), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) Word has length 31 [2021-05-06 01:34:50,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 01:34:50,737 INFO L225 Difference]: With dead ends: 75 [2021-05-06 01:34:50,737 INFO L226 Difference]: Without dead ends: 42 [2021-05-06 01:34:50,739 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 13.7ms TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-05-06 01:34:50,739 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-05-06 01:34:50,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2021-05-06 01:34:50,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 27 states have internal predecessors, (29), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 01:34:50,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2021-05-06 01:34:50,753 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 31 [2021-05-06 01:34:50,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 01:34:50,754 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2021-05-06 01:34:50,754 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), 4 states have call successors, (6), 4 states have call predecessors, (6), 2 states have return successors, (4), 2 states have call predecessors, (4), 3 states have call successors, (4) [2021-05-06 01:34:50,754 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2021-05-06 01:34:50,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 01:34:50,755 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 01:34:50,755 INFO L523 BasicCegarLoop]: trace histogram [3, 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] [2021-05-06 01:34:50,956 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 01:34:50,956 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 01:34:50,957 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 01:34:50,957 INFO L82 PathProgramCache]: Analyzing trace with hash 202176206, now seen corresponding path program 1 times [2021-05-06 01:34:50,957 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 01:34:50,957 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [775644022] [2021-05-06 01:34:50,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 01:34:50,971 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 01:34:50,971 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [540682723] [2021-05-06 01:34:50,971 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 [2021-05-06 01:34:51,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:34:51,030 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 01:34:51,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 01:34:51,136 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:51,147 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 01:34:51,148 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 01:34:51,148 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [775644022] [2021-05-06 01:34:51,148 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 01:34:51,148 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [540682723] [2021-05-06 01:34:51,148 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [540682723] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 01:34:51,148 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 01:34:51,148 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2021-05-06 01:34:51,148 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1222696243] [2021-05-06 01:34:51,149 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 01:34:51,149 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 01:34:51,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 01:34:51,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-05-06 01:34:51,149 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 01:34:51,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 01:34:51,231 INFO L93 Difference]: Finished difference Result 58 states and 64 transitions. [2021-05-06 01:34:51,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-05-06 01:34:51,231 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 34 [2021-05-06 01:34:51,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 01:34:51,233 INFO L225 Difference]: With dead ends: 58 [2021-05-06 01:34:51,234 INFO L226 Difference]: Without dead ends: 55 [2021-05-06 01:34:51,236 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 43.3ms TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2021-05-06 01:34:51,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-05-06 01:34:51,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2021-05-06 01:34:51,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 52 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 36 states have internal predecessors, (38), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (8), 8 states have call predecessors, (8), 8 states have call successors, (8) [2021-05-06 01:34:51,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 56 transitions. [2021-05-06 01:34:51,251 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 56 transitions. Word has length 34 [2021-05-06 01:34:51,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 01:34:51,252 INFO L480 AbstractCegarLoop]: Abstraction has 52 states and 56 transitions. [2021-05-06 01:34:51,252 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-05-06 01:34:51,252 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 56 transitions. [2021-05-06 01:34:51,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 01:34:51,253 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 01:34:51,253 INFO L523 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 01:34:51,456 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-05-06 01:34:51,457 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 01:34:51,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 01:34:51,457 INFO L82 PathProgramCache]: Analyzing trace with hash 203665756, now seen corresponding path program 1 times [2021-05-06 01:34:51,458 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 01:34:51,458 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [341342036] [2021-05-06 01:34:51,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 01:34:51,477 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 01:34:51,477 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [978954708] [2021-05-06 01:34:51,477 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 [2021-05-06 01:34:51,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 01:34:51,546 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 4 conjunts are in the unsatisfiable core [2021-05-06 01:34:51,554 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 01:34:51,597 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:51,599 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:51,606 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:51,607 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 01:34:51,621 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 01:34:51,621 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 01:34:51,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [341342036] [2021-05-06 01:34:51,621 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 01:34:51,621 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [978954708] [2021-05-06 01:34:51,621 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [978954708] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 01:34:51,621 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 01:34:51,622 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-05-06 01:34:51,622 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168370098] [2021-05-06 01:34:51,622 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-05-06 01:34:51,622 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 01:34:51,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-05-06 01:34:51,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-05-06 01:34:51,623 INFO L87 Difference]: Start difference. First operand 52 states and 56 transitions. Second operand has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-05-06 01:34:51,643 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 01:34:51,643 INFO L93 Difference]: Finished difference Result 52 states and 56 transitions. [2021-05-06 01:34:51,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 01:34:51,644 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 34 [2021-05-06 01:34:51,644 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 01:34:51,644 INFO L225 Difference]: With dead ends: 52 [2021-05-06 01:34:51,644 INFO L226 Difference]: Without dead ends: 0 [2021-05-06 01:34:51,645 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 13.8ms TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 01:34:51,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-06 01:34:51,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-06 01:34:51,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-06 01:34:51,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-06 01:34:51,645 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 34 [2021-05-06 01:34:51,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 01:34:51,645 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-06 01:34:51,645 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 5 states, 5 states have (on average 4.2) internal successors, (21), 5 states have internal predecessors, (21), 2 states have call successors, (6), 2 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-05-06 01:34:51,645 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-06 01:34:51,646 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-06 01:34:51,860 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 01:34:51,862 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-05-06 01:34:52,136 INFO L198 CegarLoopUtils]: For program point reach_errorEXIT(line 8) no Hoare annotation was computed. [2021-05-06 01:34:52,136 INFO L198 CegarLoopUtils]: For program point reach_errorENTRY(line 8) no Hoare annotation was computed. [2021-05-06 01:34:52,136 INFO L198 CegarLoopUtils]: For program point reach_errorFINAL(line 8) no Hoare annotation was computed. [2021-05-06 01:34:52,136 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initFINAL(line -1) no Hoare annotation was computed. [2021-05-06 01:34:52,137 INFO L194 CegarLoopUtils]: At program point ULTIMATE.initENTRY(line -1) the Hoare annotation is: (and (= |#t~string5.base| |old(#t~string5.base)|) (= |#t~string5.offset| |old(#t~string5.offset)|) (= |old(#length)| |#length|) (= |#t~string6.base| |old(#t~string6.base)|) (= |#t~string6.offset| |old(#t~string6.offset)|) (= |#t~string4.base| |old(#t~string4.base)|) (= |#NULL.base| |old(#NULL.base)|) (= ~counter~0 |old(~counter~0)|) (= |#t~string4.offset| |old(#t~string4.offset)|) (= |#NULL.offset| |old(#NULL.offset)|) (= |old(#valid)| |#valid|)) [2021-05-06 01:34:52,137 INFO L198 CegarLoopUtils]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2021-05-06 01:34:52,137 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-05-06 01:34:52,137 INFO L194 CegarLoopUtils]: At program point L-1(line -1) the Hoare annotation is: (and (<= ~counter~0 0) (<= 0 ~counter~0)) [2021-05-06 01:34:52,137 INFO L201 CegarLoopUtils]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2021-05-06 01:34:52,137 INFO L198 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2021-05-06 01:34:52,137 INFO L201 CegarLoopUtils]: At program point assume_abort_if_notENTRY(lines 11 13) the Hoare annotation is: true [2021-05-06 01:34:52,137 INFO L198 CegarLoopUtils]: For program point L12(line 12) no Hoare annotation was computed. [2021-05-06 01:34:52,137 INFO L198 CegarLoopUtils]: For program point L12-2(lines 11 13) no Hoare annotation was computed. [2021-05-06 01:34:52,137 INFO L198 CegarLoopUtils]: For program point assume_abort_if_notEXIT(lines 11 13) no Hoare annotation was computed. [2021-05-06 01:34:52,138 INFO L194 CegarLoopUtils]: At program point L37-4(lines 37 61) the Hoare annotation is: (let ((.cse0 (<= 1 main_~y~0))) (or (not (<= |old(~counter~0)| 0)) (and (= main_~q~0 0) (= main_~x~0 main_~r~0) .cse0) (not (<= 0 |old(~counter~0)|)) (and (= main_~x~0 (+ main_~y~0 main_~r~0)) (<= 1 ~counter~0) .cse0 (= main_~q~0 1)))) [2021-05-06 01:34:52,138 INFO L198 CegarLoopUtils]: For program point mainEXIT(lines 23 65) no Hoare annotation was computed. [2021-05-06 01:34:52,138 INFO L194 CegarLoopUtils]: At program point L54(line 54) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (not (<= 0 |old(~counter~0)|))) [2021-05-06 01:34:52,138 INFO L198 CegarLoopUtils]: For program point L54-1(line 54) no Hoare annotation was computed. [2021-05-06 01:34:52,138 INFO L194 CegarLoopUtils]: At program point L48(line 48) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (not (<= 0 |old(~counter~0)|))) [2021-05-06 01:34:52,138 INFO L198 CegarLoopUtils]: For program point L46-1(lines 46 58) no Hoare annotation was computed. [2021-05-06 01:34:52,138 INFO L198 CegarLoopUtils]: For program point mainFINAL(lines 23 65) no Hoare annotation was computed. [2021-05-06 01:34:52,138 INFO L194 CegarLoopUtils]: At program point L46-3(lines 46 58) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (not (<= 0 |old(~counter~0)|)) (and (<= 1 ~counter~0) (= main_~q~0 0) (= main_~b~0 main_~y~0) (= main_~x~0 main_~r~0) (= main_~a~0 1) (<= 1 main_~y~0))) [2021-05-06 01:34:52,138 INFO L198 CegarLoopUtils]: For program point L46-4(lines 46 58) no Hoare annotation was computed. [2021-05-06 01:34:52,138 INFO L194 CegarLoopUtils]: At program point L38(line 38) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (not (<= 0 |old(~counter~0)|)) (and (<= 1 ~counter~0) (= main_~q~0 0) (= main_~x~0 main_~r~0) (<= 1 main_~y~0) (= main_~a~0 0) (= main_~b~0 0))) [2021-05-06 01:34:52,138 INFO L194 CegarLoopUtils]: At program point L38-1(line 38) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (and (<= 1 ~counter~0) (= main_~q~0 0) (= main_~x~0 main_~r~0) (<= 1 main_~y~0)) (not (<= 0 |old(~counter~0)|))) [2021-05-06 01:34:52,138 INFO L198 CegarLoopUtils]: For program point L63(line 63) no Hoare annotation was computed. [2021-05-06 01:34:52,139 INFO L194 CegarLoopUtils]: At program point L30(line 30) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (not (<= 0 |old(~counter~0)|)) (= ~counter~0 |old(~counter~0)|)) [2021-05-06 01:34:52,139 INFO L194 CegarLoopUtils]: At program point mainENTRY(lines 23 65) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (not (<= 0 |old(~counter~0)|)) (= ~counter~0 |old(~counter~0)|)) [2021-05-06 01:34:52,139 INFO L198 CegarLoopUtils]: For program point L30-1(line 30) no Hoare annotation was computed. [2021-05-06 01:34:52,139 INFO L198 CegarLoopUtils]: For program point L49(lines 46 58) no Hoare annotation was computed. [2021-05-06 01:34:52,139 INFO L194 CegarLoopUtils]: At program point L47(line 47) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (not (<= 0 |old(~counter~0)|))) [2021-05-06 01:34:52,139 INFO L194 CegarLoopUtils]: At program point L47-1(line 47) the Hoare annotation is: (or (not (<= |old(~counter~0)| 0)) (not (<= 0 |old(~counter~0)|))) [2021-05-06 01:34:52,139 INFO L198 CegarLoopUtils]: For program point L39(lines 37 61) no Hoare annotation was computed. [2021-05-06 01:34:52,139 INFO L198 CegarLoopUtils]: For program point L37-1(lines 37 61) no Hoare annotation was computed. [2021-05-06 01:34:52,139 INFO L194 CegarLoopUtils]: At program point L37-3(lines 37 61) the Hoare annotation is: (let ((.cse0 (<= 1 main_~y~0))) (or (not (<= |old(~counter~0)| 0)) (and (= main_~q~0 0) (= main_~x~0 main_~r~0) (<= ~counter~0 0) .cse0 (= main_~a~0 0) (= main_~b~0 0) (<= 0 ~counter~0)) (not (<= 0 |old(~counter~0)|)) (and (= main_~x~0 (+ main_~y~0 main_~r~0)) .cse0 (= main_~q~0 1) (<= 2 ~counter~0)))) [2021-05-06 01:34:52,139 INFO L198 CegarLoopUtils]: For program point L16(lines 16 17) no Hoare annotation was computed. [2021-05-06 01:34:52,139 INFO L198 CegarLoopUtils]: For program point L15(lines 15 18) no Hoare annotation was computed. [2021-05-06 01:34:52,139 INFO L201 CegarLoopUtils]: At program point __VERIFIER_assertENTRY(lines 14 20) the Hoare annotation is: true [2021-05-06 01:34:52,139 INFO L198 CegarLoopUtils]: For program point L15-2(lines 14 20) no Hoare annotation was computed. [2021-05-06 01:34:52,139 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertEXIT(lines 14 20) no Hoare annotation was computed. [2021-05-06 01:34:52,140 INFO L198 CegarLoopUtils]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 17) no Hoare annotation was computed. [2021-05-06 01:34:52,152 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 01:34:52 BoogieIcfgContainer [2021-05-06 01:34:52,152 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-06 01:34:52,153 INFO L168 Benchmark]: Toolchain (without parser) took 4474.45 ms. Allocated memory was 180.4 MB in the beginning and 217.1 MB in the end (delta: 36.7 MB). Free memory was 143.5 MB in the beginning and 110.7 MB in the end (delta: 32.8 MB). Peak memory consumption was 69.8 MB. Max. memory is 8.0 GB. [2021-05-06 01:34:52,153 INFO L168 Benchmark]: CDTParser took 0.14 ms. Allocated memory is still 180.4 MB. Free memory is still 160.1 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-06 01:34:52,153 INFO L168 Benchmark]: CACSL2BoogieTranslator took 187.99 ms. Allocated memory is still 180.4 MB. Free memory was 143.3 MB in the beginning and 160.9 MB in the end (delta: -17.6 MB). Peak memory consumption was 8.8 MB. Max. memory is 8.0 GB. [2021-05-06 01:34:52,153 INFO L168 Benchmark]: Boogie Preprocessor took 57.12 ms. Allocated memory is still 180.4 MB. Free memory was 160.9 MB in the beginning and 163.4 MB in the end (delta: -2.5 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-06 01:34:52,154 INFO L168 Benchmark]: RCFGBuilder took 365.27 ms. Allocated memory is still 180.4 MB. Free memory was 163.4 MB in the beginning and 147.4 MB in the end (delta: 16.0 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. [2021-05-06 01:34:52,154 INFO L168 Benchmark]: TraceAbstraction took 3857.76 ms. Allocated memory was 180.4 MB in the beginning and 217.1 MB in the end (delta: 36.7 MB). Free memory was 147.0 MB in the beginning and 110.7 MB in the end (delta: 36.3 MB). Peak memory consumption was 73.4 MB. Max. memory is 8.0 GB. [2021-05-06 01:34:52,154 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.14 ms. Allocated memory is still 180.4 MB. Free memory is still 160.1 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 187.99 ms. Allocated memory is still 180.4 MB. Free memory was 143.3 MB in the beginning and 160.9 MB in the end (delta: -17.6 MB). Peak memory consumption was 8.8 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 57.12 ms. Allocated memory is still 180.4 MB. Free memory was 160.9 MB in the beginning and 163.4 MB in the end (delta: -2.5 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 365.27 ms. Allocated memory is still 180.4 MB. Free memory was 163.4 MB in the beginning and 147.4 MB in the end (delta: 16.0 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3857.76 ms. Allocated memory was 180.4 MB in the beginning and 217.1 MB in the end (delta: 36.7 MB). Free memory was 147.0 MB in the beginning and 110.7 MB in the end (delta: 36.3 MB). Peak memory consumption was 73.4 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 17]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 41 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 3515.3ms, OverallIterations: 7, TraceHistogramMax: 3, EmptinessCheckTime: 11.1ms, AutomataDifference: 593.6ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 274.4ms, InitialAbstractionConstructionTime: 9.7ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 248 SDtfs, 93 SDslu, 664 SDs, 0 SdLazy, 261 SolverSat, 29 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 300.5ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 166 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 267.8ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=54occurred in iteration=4, InterpolantAutomatonStates: 40, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 130.3ms AutomataMinimizationTime, 7 MinimizatonAttempts, 10 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: 0.0ms HoareAnnotationTime, 16 LocationsWithAnnotation, 43 PreInvPairs, 50 NumberOfFragments, 262 HoareAnnotationTreeSize, 43 FomulaSimplifications, 57 FormulaSimplificationTreeSizeReduction, 73.4ms HoareSimplificationTime, 16 FomulaSimplificationsInter, 216 FormulaSimplificationTreeSizeReductionInter, 189.6ms HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 65.5ms SsaConstructionTime, 174.1ms SatisfiabilityAnalysisTime, 894.5ms InterpolantComputationTime, 175 NumberOfCodeBlocks, 175 NumberOfCodeBlocksAsserted, 7 NumberOfCheckSat, 168 ConstructedInterpolants, 0 QuantifiedInterpolants, 470 SizeOfPredicates, 10 NumberOfNonLiveVariables, 831 ConjunctsInSsa, 55 ConjunctsInUnsatCore, 7 InterpolantComputations, 6 PerfectInterpolantSequences, 29/31 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 - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 46]: Loop Invariant Derived loop invariant: (!(\old(counter) <= 0) || !(0 <= \old(counter))) || (((((1 <= counter && q == 0) && b == y) && x == r) && a == 1) && 1 <= y) - InvariantResult [Line: 37]: Loop Invariant Derived loop invariant: ((!(\old(counter) <= 0) || ((((((q == 0 && x == r) && counter <= 0) && 1 <= y) && a == 0) && b == 0) && 0 <= counter)) || !(0 <= \old(counter))) || (((x == y + r && 1 <= y) && q == 1) && 2 <= counter) RESULT: Ultimate proved your program to be correct! Received shutdown request...