/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-36cd7be [2021-02-23 18:49:30,332 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-23 18:49:30,337 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-23 18:49:30,396 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-02-23 18:49:30,428 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-02-23 18:49:30,431 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-02-23 18:49:30,433 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-02-23 18:49:30,436 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-02-23 18:49:30,441 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-02-23 18:49:30,443 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-02-23 18:49:30,452 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-02-23 18:49:30,460 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-02-23 18:49:30,465 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-02-23 18:49:30,467 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-02-23 18:49:30,469 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-02-23 18:49:30,493 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-02-23 18:49:30,504 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-02-23 18:49:30,516 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-02-23 18:49:30,518 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-02-23 18:49:30,518 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-02-23 18:49:30,520 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2021-02-23 18:49:30,546 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-23 18:49:30,546 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-23 18:49:30,551 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-23 18:49:30,551 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-23 18:49:30,551 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-23 18:49:30,552 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-23 18:49:30,552 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-23 18:49:30,552 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-23 18:49:30,552 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-23 18:49:30,553 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-23 18:49:30,553 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-23 18:49:30,554 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-23 18:49:30,554 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-23 18:49:30,555 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-23 18:49:30,555 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-23 18:49:30,556 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2021-02-23 18:49:30,556 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-23 18:49:30,556 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-23 18:49:30,556 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-23 18:49:30,557 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-23 18:49:30,557 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-02-23 18:49:30,557 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-23 18:49:30,557 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-23 18:49:31,030 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-23 18:49:31,061 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-23 18:49:31,065 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-23 18:49:31,066 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-23 18:49:31,067 INFO L275 PluginConnector]: CDTParser initialized [2021-02-23 18:49:31,068 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2021-02-23 18:49:31,168 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e56bb87b1/623cfa2fd3de4b3db9ab951bba2d57da/FLAG129ac892a [2021-02-23 18:49:31,871 INFO L306 CDTParser]: Found 1 translation units. [2021-02-23 18:49:31,872 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2021-02-23 18:49:31,879 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e56bb87b1/623cfa2fd3de4b3db9ab951bba2d57da/FLAG129ac892a [2021-02-23 18:49:32,242 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e56bb87b1/623cfa2fd3de4b3db9ab951bba2d57da [2021-02-23 18:49:32,247 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-23 18:49:32,261 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-23 18:49:32,263 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-23 18:49:32,263 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-23 18:49:32,267 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-23 18:49:32,268 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 06:49:32" (1/1) ... [2021-02-23 18:49:32,270 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@57df578 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:49:32, skipping insertion in model container [2021-02-23 18:49:32,270 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 06:49:32" (1/1) ... [2021-02-23 18:49:32,279 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-23 18:49:32,293 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-23 18:49:32,429 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_4-2.c[322,335] [2021-02-23 18:49:32,440 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-23 18:49:32,451 INFO L203 MainTranslator]: Completed pre-run [2021-02-23 18:49:32,463 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_4-2.c[322,335] [2021-02-23 18:49:32,465 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-23 18:49:32,481 INFO L208 MainTranslator]: Completed translation [2021-02-23 18:49:32,482 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:49:32 WrapperNode [2021-02-23 18:49:32,482 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-23 18:49:32,483 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-23 18:49:32,483 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-23 18:49:32,483 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-23 18:49:32,496 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:49:32" (1/1) ... [2021-02-23 18:49:32,496 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:49:32" (1/1) ... [2021-02-23 18:49:32,502 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:49:32" (1/1) ... [2021-02-23 18:49:32,503 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:49:32" (1/1) ... [2021-02-23 18:49:32,507 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:49:32" (1/1) ... [2021-02-23 18:49:32,511 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:49:32" (1/1) ... [2021-02-23 18:49:32,513 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:49:32" (1/1) ... [2021-02-23 18:49:32,515 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-23 18:49:32,516 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-23 18:49:32,516 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-23 18:49:32,516 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-23 18:49:32,517 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:49:32" (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 [2021-02-23 18:49:32,628 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-23 18:49:32,628 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-23 18:49:32,629 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-23 18:49:32,629 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-02-23 18:49:32,629 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-23 18:49:32,629 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-23 18:49:32,629 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-23 18:49:32,630 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-23 18:49:32,630 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-23 18:49:32,631 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-02-23 18:49:32,631 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-23 18:49:32,632 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-23 18:49:32,632 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-23 18:49:32,632 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-23 18:49:32,632 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-23 18:49:32,633 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-23 18:49:32,633 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-23 18:49:32,972 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-23 18:49:32,972 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-02-23 18:49:32,978 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 06:49:32 BoogieIcfgContainer [2021-02-23 18:49:32,981 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-23 18:49:32,987 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-23 18:49:32,987 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-23 18:49:32,999 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-23 18:49:32,999 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.02 06:49:32" (1/3) ... [2021-02-23 18:49:33,001 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d1e8d0d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 06:49:33, skipping insertion in model container [2021-02-23 18:49:33,004 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 06:49:32" (2/3) ... [2021-02-23 18:49:33,005 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d1e8d0d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 06:49:33, skipping insertion in model container [2021-02-23 18:49:33,005 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 06:49:32" (3/3) ... [2021-02-23 18:49:33,010 INFO L111 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2021-02-23 18:49:33,029 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-02-23 18:49:33,042 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-23 18:49:33,088 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-23 18:49:33,127 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-23 18:49:33,127 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-23 18:49:33,128 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-02-23 18:49:33,128 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-23 18:49:33,128 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-23 18:49:33,128 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-23 18:49:33,128 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-23 18:49:33,128 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-23 18:49:33,146 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2021-02-23 18:49:33,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-02-23 18:49:33,156 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 18:49:33,157 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 18:49:33,158 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 18:49:33,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 18:49:33,165 INFO L82 PathProgramCache]: Analyzing trace with hash -1656760041, now seen corresponding path program 1 times [2021-02-23 18:49:33,176 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 18:49:33,177 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [200689918] [2021-02-23 18:49:33,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 18:49:33,268 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 18:49:33,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:49:33,539 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:49:33,542 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:49:33,562 WARN L141 QuantifierPusher]: treesize reduction 1, result has 95.0 percent of original size [2021-02-23 18:49:33,566 WARN L147 QuantifierPusher]: treesize reduction 1, result has 95.0 percent of original size 19 [2021-02-23 18:49:33,638 WARN L141 QuantifierPusher]: treesize reduction 17, result has 5.6 percent of original size [2021-02-23 18:49:33,642 WARN L147 QuantifierPusher]: treesize reduction 17, result has 5.6 percent of original size 1 [2021-02-23 18:49:33,645 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:49:33,646 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:49:33,708 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 18:49:33,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 18:49:33,744 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 18:49:33,746 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 18:49:33,755 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 18:49:33,764 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [200689918] [2021-02-23 18:49:33,770 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 18:49:33,770 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-02-23 18:49:33,771 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1978316772] [2021-02-23 18:49:33,778 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-02-23 18:49:33,780 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 18:49:33,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-02-23 18:49:33,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-02-23 18:49:33,796 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 4 states. [2021-02-23 18:49:34,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 18:49:34,010 INFO L93 Difference]: Finished difference Result 40 states and 45 transitions. [2021-02-23 18:49:34,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-02-23 18:49:34,014 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2021-02-23 18:49:34,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 18:49:34,023 INFO L225 Difference]: With dead ends: 40 [2021-02-23 18:49:34,023 INFO L226 Difference]: Without dead ends: 22 [2021-02-23 18:49:34,029 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-02-23 18:49:34,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-02-23 18:49:34,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-02-23 18:49:34,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2021-02-23 18:49:34,072 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2021-02-23 18:49:34,074 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2021-02-23 18:49:34,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 18:49:34,075 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2021-02-23 18:49:34,075 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2021-02-23 18:49:34,075 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2021-02-23 18:49:34,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-02-23 18:49:34,077 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 18:49:34,077 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 18:49:34,077 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-23 18:49:34,077 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 18:49:34,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 18:49:34,078 INFO L82 PathProgramCache]: Analyzing trace with hash -1871261994, now seen corresponding path program 1 times [2021-02-23 18:49:34,079 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 18:49:34,079 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1904360190] [2021-02-23 18:49:34,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY