/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/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/nla-digbench/divbin.i -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 06:53:19,187 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 06:53:19,188 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 06:53:19,213 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 06:53:19,275 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 06:53:19,275 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 06:53:19,276 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 06:53:19,276 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-06 06:53:19,283 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 06:53:19,283 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 06:53:19,284 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 06:53:19,284 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 06:53:19,285 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 06:53:19,285 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 06:53:19,285 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 06:53:19,285 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 06:53:19,285 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 06:53:19,285 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 06:53:19,285 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 06:53:19,285 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 06:53:19,285 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 06:53:19,286 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 06:53:19,286 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 06:53:19,286 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 06:53:19,286 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 06:53:19,286 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 06:53:19,286 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 06:53:19,286 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 06:53:19,286 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 06:53:19,287 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-06 06:53:19,287 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 06:53:19,595 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 06:53:19,616 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 06:53:19,617 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 06:53:19,618 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 06:53:19,619 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 06:53:19,619 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/nla-digbench/divbin.i [2021-05-06 06:53:19,666 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ffea795b3/623ae54984b646d18c48d67a670c933c/FLAG9ddf59c26 [2021-05-06 06:53:20,040 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 06:53:20,040 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/nla-digbench/divbin.i [2021-05-06 06:53:20,045 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ffea795b3/623ae54984b646d18c48d67a670c933c/FLAG9ddf59c26 [2021-05-06 06:53:20,455 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ffea795b3/623ae54984b646d18c48d67a670c933c [2021-05-06 06:53:20,456 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 06:53:20,458 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-06 06:53:20,461 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 06:53:20,461 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 06:53:20,463 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 06:53:20,464 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 06:53:20" (1/1) ... [2021-05-06 06:53:20,465 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@479b44cc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:53:20, skipping insertion in model container [2021-05-06 06:53:20,465 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 06:53:20" (1/1) ... [2021-05-06 06:53:20,469 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 06:53:20,480 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 06:53:20,604 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/divbin.i[958,971] [2021-05-06 06:53:20,616 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 06:53:20,621 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 06:53:20,642 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/divbin.i[958,971] [2021-05-06 06:53:20,655 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 06:53:20,664 INFO L208 MainTranslator]: Completed translation [2021-05-06 06:53:20,664 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:53:20 WrapperNode [2021-05-06 06:53:20,664 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 06:53:20,665 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 06:53:20,665 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 06:53:20,665 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 06:53:20,704 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:53:20" (1/1) ... [2021-05-06 06:53:20,704 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:53:20" (1/1) ... [2021-05-06 06:53:20,711 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:53:20" (1/1) ... [2021-05-06 06:53:20,711 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:53:20" (1/1) ... [2021-05-06 06:53:20,720 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:53:20" (1/1) ... [2021-05-06 06:53:20,723 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:53:20" (1/1) ... [2021-05-06 06:53:20,726 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:53:20" (1/1) ... [2021-05-06 06:53:20,729 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 06:53:20,730 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 06:53:20,730 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 06:53:20,731 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 06:53:20,731 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:53:20" (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 06:53:20,885 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 06:53:20,885 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 06:53:20,885 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 06:53:20,885 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 06:53:20,885 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 06:53:20,885 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 06:53:20,885 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 06:53:20,886 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 06:53:20,886 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_perror_fail [2021-05-06 06:53:20,886 INFO L130 BoogieDeclarations]: Found specification of procedure __assert [2021-05-06 06:53:20,886 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 06:53:20,886 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 06:53:20,886 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_unsigned_int [2021-05-06 06:53:20,886 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 06:53:20,886 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 06:53:20,886 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 06:53:20,887 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 06:53:20,887 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 06:53:20,887 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 06:53:20,887 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 06:53:20,888 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 06:53:20,888 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 06:53:21,101 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 06:53:21,102 INFO L299 CfgBuilder]: Removed 2 assume(true) statements. [2021-05-06 06:53:21,102 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 06:53:21 BoogieIcfgContainer [2021-05-06 06:53:21,103 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 06:53:21,103 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-06 06:53:21,103 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-06 06:53:21,104 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-06 06:53:21,105 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 06:53:21" (1/1) ... [2021-05-06 06:53:21,131 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 06:53:21 BasicIcfg [2021-05-06 06:53:21,132 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-06 06:53:21,133 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 06:53:21,133 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 06:53:21,149 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 06:53:21,149 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 06:53:20" (1/4) ... [2021-05-06 06:53:21,150 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74c105d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 06:53:21, skipping insertion in model container [2021-05-06 06:53:21,150 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:53:20" (2/4) ... [2021-05-06 06:53:21,150 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74c105d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 06:53:21, skipping insertion in model container [2021-05-06 06:53:21,150 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 06:53:21" (3/4) ... [2021-05-06 06:53:21,151 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@74c105d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 06:53:21, skipping insertion in model container [2021-05-06 06:53:21,151 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 06:53:21" (4/4) ... [2021-05-06 06:53:21,151 INFO L111 eAbstractionObserver]: Analyzing ICFG divbin.iJordan [2021-05-06 06:53:21,155 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-06 06:53:21,157 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 06:53:21,183 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 06:53:21,194 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 06:53:21,195 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-06 06:53:21,195 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-06 06:53:21,195 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 06:53:21,195 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 06:53:21,195 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 06:53:21,195 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 06:53:21,195 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 06:53:21,207 INFO L276 IsEmpty]: Start isEmpty. Operand has 31 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) [2021-05-06 06:53:21,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 06:53:21,212 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:53:21,213 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:53:21,213 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:53:21,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:53:21,220 INFO L82 PathProgramCache]: Analyzing trace with hash 227793864, now seen corresponding path program 1 times [2021-05-06 06:53:21,225 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:53:21,225 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1969725659] [2021-05-06 06:53:21,226 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:53:21,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:53:21,398 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:53:21,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:53:21,434 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-06 06:53:21,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:53:21,441 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-06 06:53:21,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:53:21,446 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 06:53:21,447 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:53:21,447 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1969725659] [2021-05-06 06:53:21,447 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1969725659] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 06:53:21,447 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 06:53:21,448 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 06:53:21,448 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812758697] [2021-05-06 06:53:21,451 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 06:53:21,451 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:53:21,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 06:53:21,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 06:53:21,459 INFO L87 Difference]: Start difference. First operand has 31 states, 19 states have (on average 1.5263157894736843) internal successors, (29), 20 states have internal predecessors, (29), 6 states have call successors, (6), 4 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 6 states have call successors, (6) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 06:53:21,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:53:21,519 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-05-06 06:53:21,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 06:53:21,520 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 23 [2021-05-06 06:53:21,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:53:21,525 INFO L225 Difference]: With dead ends: 31 [2021-05-06 06:53:21,525 INFO L226 Difference]: Without dead ends: 26 [2021-05-06 06:53:21,526 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 39.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 06:53:21,536 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-06 06:53:21,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-06 06:53:21,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.25) internal successors, (20), 17 states have internal predecessors, (20), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-05-06 06:53:21,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-05-06 06:53:21,550 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 23 [2021-05-06 06:53:21,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:53:21,551 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-05-06 06:53:21,551 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 2 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 06:53:21,551 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-05-06 06:53:21,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-05-06 06:53:21,553 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:53:21,553 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:53:21,553 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 06:53:21,553 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:53:21,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:53:21,554 INFO L82 PathProgramCache]: Analyzing trace with hash -1977749520, now seen corresponding path program 1 times [2021-05-06 06:53:21,554 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:53:21,555 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1342836041] [2021-05-06 06:53:21,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:53:21,581 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 06:53:21,582 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1661806697] [2021-05-06 06:53:21,582 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 06:53:21,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:53:21,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 06:53:21,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:53:21,721 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:53:21,724 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:53:21,802 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:53:21,808 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:53:21,825 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:53:21,839 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 06:53:21,840 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:53:21,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1342836041] [2021-05-06 06:53:21,840 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 06:53:21,840 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1661806697] [2021-05-06 06:53:21,840 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1661806697] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:53:21,840 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 06:53:21,840 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 06:53:21,840 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1714496734] [2021-05-06 06:53:21,841 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 06:53:21,841 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:53:21,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 06:53:21,842 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-05-06 06:53:21,842 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 06:53:21,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:53:21,969 INFO L93 Difference]: Finished difference Result 37 states and 44 transitions. [2021-05-06 06:53:21,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 06:53:21,969 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2021-05-06 06:53:21,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:53:21,970 INFO L225 Difference]: With dead ends: 37 [2021-05-06 06:53:21,970 INFO L226 Difference]: Without dead ends: 36 [2021-05-06 06:53:21,971 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 101.0ms TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-05-06 06:53:21,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-06 06:53:21,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-05-06 06:53:21,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 24 states have (on average 1.25) internal successors, (30), 25 states have internal predecessors, (30), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 06:53:21,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 42 transitions. [2021-05-06 06:53:21,975 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 42 transitions. Word has length 24 [2021-05-06 06:53:21,976 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:53:21,976 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 42 transitions. [2021-05-06 06:53:21,976 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 1.7777777777777777) internal successors, (16), 7 states have internal predecessors, (16), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-05-06 06:53:21,976 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 42 transitions. [2021-05-06 06:53:21,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-06 06:53:21,976 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:53:21,976 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:53:22,194 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-05-06 06:53:22,194 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:53:22,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:53:22,195 INFO L82 PathProgramCache]: Analyzing trace with hash 154407786, now seen corresponding path program 1 times [2021-05-06 06:53:22,195 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:53:22,195 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1992052133] [2021-05-06 06:53:22,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:53:22,204 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 06:53:22,204 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1538748361] [2021-05-06 06:53:22,204 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 06:53:22,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:53:22,340 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 06:53:22,341 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:53:22,421 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:53:22,424 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:53:22,454 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:53:22,457 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:53:22,470 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:53:22,484 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-05-06 06:53:22,484 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:53:22,484 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1992052133] [2021-05-06 06:53:22,484 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 06:53:22,484 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1538748361] [2021-05-06 06:53:22,484 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1538748361] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:53:22,484 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2021-05-06 06:53:22,484 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2021-05-06 06:53:22,484 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134935325] [2021-05-06 06:53:22,485 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-06 06:53:22,485 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:53:22,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-06 06:53:22,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-05-06 06:53:22,485 INFO L87 Difference]: Start difference. First operand 36 states and 42 transitions. Second operand has 9 states, 9 states have (on average 2.0) internal successors, (18), 7 states have internal predecessors, (18), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-06 06:53:24,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:53:24,808 INFO L93 Difference]: Finished difference Result 51 states and 58 transitions. [2021-05-06 06:53:24,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-06 06:53:24,808 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), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 26 [2021-05-06 06:53:24,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:53:24,809 INFO L225 Difference]: With dead ends: 51 [2021-05-06 06:53:24,809 INFO L226 Difference]: Without dead ends: 50 [2021-05-06 06:53:24,809 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 121.2ms TimeCoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2021-05-06 06:53:24,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-05-06 06:53:24,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 43. [2021-05-06 06:53:24,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 29 states have (on average 1.206896551724138) internal successors, (35), 30 states have internal predecessors, (35), 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 06:53:24,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 49 transitions. [2021-05-06 06:53:24,813 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 49 transitions. Word has length 26 [2021-05-06 06:53:24,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:53:24,813 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 49 transitions. [2021-05-06 06:53:24,813 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), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-05-06 06:53:24,813 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 49 transitions. [2021-05-06 06:53:24,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-05-06 06:53:24,814 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:53:24,814 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:53:25,015 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:53:25,015 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:53:25,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:53:25,015 INFO L82 PathProgramCache]: Analyzing trace with hash 1097850398, now seen corresponding path program 1 times [2021-05-06 06:53:25,016 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:53:25,016 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2122638395] [2021-05-06 06:53:25,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:53:25,023 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 06:53:25,023 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [720163489] [2021-05-06 06:53:25,023 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 06:53:25,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:53:25,145 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2021-05-06 06:53:25,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:53:25,210 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 06:53:25,210 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:53:25,210 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2122638395] [2021-05-06 06:53:25,210 WARN L340 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2021-05-06 06:53:25,210 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [720163489] [2021-05-06 06:53:25,210 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [720163489] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 06:53:25,210 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 06:53:25,210 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 06:53:25,210 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167175341] [2021-05-06 06:53:25,212 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 06:53:25,212 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:53:25,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 06:53:25,212 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 06:53:25,212 INFO L87 Difference]: Start difference. First operand 43 states and 49 transitions. Second operand has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 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 06:53:25,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:53:25,234 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2021-05-06 06:53:25,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 06:53:25,234 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 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 32 [2021-05-06 06:53:25,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:53:25,236 INFO L225 Difference]: With dead ends: 42 [2021-05-06 06:53:25,237 INFO L226 Difference]: Without dead ends: 35 [2021-05-06 06:53:25,237 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 06:53:25,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-05-06 06:53:25,239 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-05-06 06:53:25,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 23 states have (on average 1.173913043478261) internal successors, (27), 24 states have internal predecessors, (27), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-05-06 06:53:25,240 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2021-05-06 06:53:25,240 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 32 [2021-05-06 06:53:25,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:53:25,240 INFO L480 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2021-05-06 06:53:25,240 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 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 06:53:25,240 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2021-05-06 06:53:25,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-05-06 06:53:25,241 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:53:25,241 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:53:25,457 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:53:25,457 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:53:25,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:53:25,458 INFO L82 PathProgramCache]: Analyzing trace with hash 1313859480, now seen corresponding path program 1 times [2021-05-06 06:53:25,458 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:53:25,458 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2113166238] [2021-05-06 06:53:25,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:53:25,466 ERROR L278 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-05-06 06:53:25,466 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [17533175] [2021-05-06 06:53:25,466 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