/usr/bin/java -Xmx15000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/threadmodular/regression/inc-dec-eq0/ThreadModularVerifier.Settings.epf -tc ../../../trunk/examples/threadmodular/regression/ThreadModularUniHorn.xml -i ../../../trunk/examples/threadmodular/regression/inc-dec-eq0/inc-dec-eq0.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.3-wip.dk.sleep-threadmodular-3a8dd60-m [2023-06-12 18:01:26,790 INFO L172 SettingsManager]: Resetting all preferences to default values... [2023-06-12 18:01:26,852 INFO L100 SettingsManager]: Loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/threadmodular/regression/inc-dec-eq0/ThreadModularVerifier.Settings.epf [2023-06-12 18:01:26,858 INFO L114 SettingsManager]: Preferences different from defaults after loading the file: [2023-06-12 18:01:26,860 INFO L135 SettingsManager]: Preferences of ChcSolver differ from their defaults: [2023-06-12 18:01:26,860 INFO L137 SettingsManager]: * Produce UNSAT core if query is UNSAT=true [2023-06-12 18:01:26,860 INFO L135 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-06-12 18:01:26,861 INFO L137 SettingsManager]: * Size of a code block=OneNontrivialStatement [2023-06-12 18:01:26,861 INFO L137 SettingsManager]: * Add additional assume for each assert=false [2023-06-12 18:01:26,865 INFO L135 SettingsManager]: Preferences of ChcSmtPrinter differ from their defaults: [2023-06-12 18:01:26,865 INFO L137 SettingsManager]: * Save file in source directory=true [2023-06-12 18:01:26,865 INFO L137 SettingsManager]: * Use automatic naming=true [2023-06-12 18:01:26,866 INFO L137 SettingsManager]: * File name=CHC 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2023-06-12 18:01:27,027 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-06-12 18:01:27,045 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-06-12 18:01:27,047 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-06-12 18:01:27,047 INFO L270 PluginConnector]: Initializing Boogie PL CUP Parser... [2023-06-12 18:01:27,048 INFO L274 PluginConnector]: Boogie PL CUP Parser initialized [2023-06-12 18:01:27,049 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/threadmodular/regression/inc-dec-eq0/inc-dec-eq0.bpl [2023-06-12 18:01:27,050 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/threadmodular/regression/inc-dec-eq0/inc-dec-eq0.bpl' [2023-06-12 18:01:27,065 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-06-12 18:01:27,066 INFO L133 ToolchainWalker]: Walking toolchain with 8 elements. [2023-06-12 18:01:27,067 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-06-12 18:01:27,067 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-06-12 18:01:27,068 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-06-12 18:01:27,080 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 06:01:27" (1/1) ... [2023-06-12 18:01:27,081 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 06:01:27" (1/1) ... [2023-06-12 18:01:27,085 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 06:01:27" (1/1) ... [2023-06-12 18:01:27,086 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 06:01:27" (1/1) ... [2023-06-12 18:01:27,088 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 06:01:27" (1/1) ... [2023-06-12 18:01:27,089 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 06:01:27" (1/1) ... [2023-06-12 18:01:27,089 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 06:01:27" (1/1) ... [2023-06-12 18:01:27,090 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 06:01:27" (1/1) ... [2023-06-12 18:01:27,090 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-06-12 18:01:27,092 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-06-12 18:01:27,092 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-06-12 18:01:27,092 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-06-12 18:01:27,093 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 06:01:27" (1/1) ... [2023-06-12 18:01:27,098 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2023-06-12 18:01:27,105 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-06-12 18:01:27,116 INFO L229 MonitoredProcess]: Starting monitored process 1 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2023-06-12 18:01:27,128 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (1)] Waiting until timeout for monitored process [2023-06-12 18:01:27,150 INFO L124 BoogieDeclarations]: Specification and implementation of procedure thread given in one single declaration [2023-06-12 18:01:27,150 INFO L130 BoogieDeclarations]: Found specification of procedure thread [2023-06-12 18:01:27,151 INFO L138 BoogieDeclarations]: Found implementation of procedure thread [2023-06-12 18:01:27,183 INFO L236 CfgBuilder]: Building ICFG [2023-06-12 18:01:27,185 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-06-12 18:01:27,188 WARN L818 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2023-06-12 18:01:27,234 INFO L277 CfgBuilder]: Performing block encoding [2023-06-12 18:01:27,238 INFO L294 CfgBuilder]: Using library mode [2023-06-12 18:01:27,238 INFO L302 CfgBuilder]: Removed 0 assume(true) statements. [2023-06-12 18:01:27,239 INFO L201 PluginConnector]: Adding new model inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.06 06:01:27 BoogieIcfgContainer [2023-06-12 18:01:27,240 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-06-12 18:01:27,240 INFO L112 PluginConnector]: ------------------------IcfgToChc---------------------------- [2023-06-12 18:01:27,240 INFO L270 PluginConnector]: Initializing IcfgToChc... [2023-06-12 18:01:27,240 INFO L274 PluginConnector]: IcfgToChc initialized [2023-06-12 18:01:27,242 INFO L184 PluginConnector]: Executing the observer IcfgToChcObserver from plugin IcfgToChc for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.06 06:01:27" (1/1) ... [2023-06-12 18:01:27,440 INFO L111 IndependenceChecker]: instantiated independence condition for 'x := x - 1;' and '<[ dummy edge: assume true; ]>' is: true [2023-06-12 18:01:27,443 INFO L111 IndependenceChecker]: instantiated independence condition for 'x := x + 1;' and '<[ dummy edge: assume true; ]>' is: true [2023-06-12 18:01:27,462 INFO L111 IndependenceChecker]: instantiated independence condition for 'x := x - 1;' and 'x := x + 1;' is: true [2023-06-12 18:01:27,466 INFO L111 IndependenceChecker]: instantiated independence condition for 'x := x + 1;' and 'x := x + 1;' is: true [2023-06-12 18:01:27,474 INFO L111 IndependenceChecker]: instantiated independence condition for 'x := x - 1;' and 'x := x - 1;' is: true [2023-06-12 18:01:27,477 INFO L111 IndependenceChecker]: instantiated independence condition for 'x := x + 1;' and 'x := x - 1;' is: true [2023-06-12 18:01:27,484 INFO L111 IndependenceChecker]: instantiated independence condition for 'x := x - 1;' and '<[ dummy edge: assume true; ]>' is: true [2023-06-12 18:01:27,486 INFO L111 IndependenceChecker]: instantiated independence condition for 'x := x + 1;' and '<[ dummy edge: assume true; ]>' is: true [2023-06-12 18:01:27,555 INFO L201 PluginConnector]: Adding new model inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.icfgtochc OTHER 12.06 06:01:27 HornClauseAST [2023-06-12 18:01:27,555 INFO L131 PluginConnector]: ------------------------ END IcfgToChc---------------------------- [2023-06-12 18:01:27,555 INFO L112 PluginConnector]: ------------------------ChcSmtPrinter---------------------------- [2023-06-12 18:01:27,555 INFO L270 PluginConnector]: Initializing ChcSmtPrinter... [2023-06-12 18:01:27,556 INFO L274 PluginConnector]: ChcSmtPrinter initialized [2023-06-12 18:01:27,556 INFO L184 PluginConnector]: Executing the observer ChcSmtPrinterObserver from plugin ChcSmtPrinter for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.icfgtochc OTHER 12.06 06:01:27" (1/1) ... [2023-06-12 18:01:27,557 INFO L192 hcSmtPrinterObserver]: Writing to file /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/threadmodular/regression/inc-dec-eq0/CHC_inc-dec-eq0.bpl_UID2991120442628624528.smt2 [2023-06-12 18:01:27,584 INFO L131 PluginConnector]: ------------------------ END ChcSmtPrinter---------------------------- [2023-06-12 18:01:27,584 INFO L112 PluginConnector]: ------------------------ChcToBoogie---------------------------- [2023-06-12 18:01:27,585 INFO L270 PluginConnector]: Initializing ChcToBoogie... [2023-06-12 18:01:27,585 INFO L274 PluginConnector]: ChcToBoogie initialized [2023-06-12 18:01:27,595 INFO L184 PluginConnector]: Executing the observer ChcToBoogieObserver from plugin ChcToBoogie for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.icfgtochc OTHER 12.06 06:01:27" (1/1) ... [2023-06-12 18:01:27,610 INFO L201 PluginConnector]: Adding new model inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 12.06 06:01:27 Unit [2023-06-12 18:01:27,610 INFO L131 PluginConnector]: ------------------------ END ChcToBoogie---------------------------- [2023-06-12 18:01:27,610 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-06-12 18:01:27,611 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-06-12 18:01:27,611 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-06-12 18:01:27,611 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 12.06 06:01:27" (1/1) ... [2023-06-12 18:01:27,611 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 12.06 06:01:27" (1/1) ... [2023-06-12 18:01:27,613 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 12.06 06:01:27" (1/1) ... [2023-06-12 18:01:27,613 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 12.06 06:01:27" (1/1) ... [2023-06-12 18:01:27,621 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 12.06 06:01:27" (1/1) ... [2023-06-12 18:01:27,623 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 12.06 06:01:27" (1/1) ... [2023-06-12 18:01:27,624 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 12.06 06:01:27" (1/1) ... [2023-06-12 18:01:27,625 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 12.06 06:01:27" (1/1) ... [2023-06-12 18:01:27,626 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-06-12 18:01:27,626 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-06-12 18:01:27,626 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-06-12 18:01:27,626 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-06-12 18:01:27,626 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 12.06 06:01:27" (1/1) ... [2023-06-12 18:01:27,626 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 [2023-06-12 18:01:27,627 INFO L189 MonitoredProcess]: No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 [2023-06-12 18:01:27,629 INFO L229 MonitoredProcess]: Starting monitored process 2 with /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (exit command is (exit), workingDir is null) [2023-06-12 18:01:27,630 INFO L327 MonitoredProcess]: [MP /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 SMTLIB2_COMPLIANT=true -memory:1024 -smt2 -in -t:12000 (2)] Waiting until timeout for monitored process [2023-06-12 18:01:27,632 INFO L124 BoogieDeclarations]: Specification and implementation of procedure gotoProc given in one single declaration [2023-06-12 18:01:27,632 INFO L130 BoogieDeclarations]: Found specification of procedure gotoProc [2023-06-12 18:01:27,632 INFO L138 BoogieDeclarations]: Found implementation of procedure gotoProc [2023-06-12 18:01:27,632 INFO L124 BoogieDeclarations]: Specification and implementation of procedure Ultimate.START given in one single declaration [2023-06-12 18:01:27,633 INFO L130 BoogieDeclarations]: Found specification of procedure Ultimate.START [2023-06-12 18:01:27,633 INFO L138 BoogieDeclarations]: Found implementation of procedure Ultimate.START [2023-06-12 18:01:27,649 INFO L236 CfgBuilder]: Building ICFG [2023-06-12 18:01:27,649 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-06-12 18:01:27,857 INFO L277 CfgBuilder]: Performing block encoding [2023-06-12 18:01:27,859 INFO L294 CfgBuilder]: Using library mode [2023-06-12 18:01:27,859 INFO L302 CfgBuilder]: Removed 0 assume(true) statements. [2023-06-12 18:01:27,859 INFO L201 PluginConnector]: Adding new model inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.06 06:01:27 BoogieIcfgContainer [2023-06-12 18:01:27,859 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-06-12 18:01:27,861 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-06-12 18:01:27,861 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-06-12 18:01:27,863 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-06-12 18:01:27,863 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 06:01:27" (1/5) ... [2023-06-12 18:01:27,864 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25a619b and model type inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.06 06:01:27, skipping insertion in model container [2023-06-12 18:01:27,864 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.06 06:01:27" (2/5) ... [2023-06-12 18:01:27,864 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25a619b and model type inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 12.06 06:01:27, skipping insertion in model container [2023-06-12 18:01:27,864 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.icfgtochc OTHER 12.06 06:01:27" (3/5) ... [2023-06-12 18:01:27,864 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25a619b and model type inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction OTHER 12.06 06:01:27, skipping insertion in model container [2023-06-12 18:01:27,864 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.chctoboogie AST 12.06 06:01:27" (4/5) ... [2023-06-12 18:01:27,865 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25a619b and model type inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.06 06:01:27, skipping insertion in model container [2023-06-12 18:01:27,865 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "inc-dec-eq0.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.06 06:01:27" (5/5) ... [2023-06-12 18:01:27,866 INFO L112 eAbstractionObserver]: Analyzing ICFG de.uni_freiburg.informatik.ultimate.plugins.chctoboogie.ChcToBoogieObserver [2023-06-12 18:01:27,877 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2023-06-12 18:01:27,877 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-06-12 18:01:27,905 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-06-12 18:01:27,910 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=ForwardPredicates, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@294feb55, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-06-12 18:01:27,910 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-06-12 18:01:27,913 INFO L276 IsEmpty]: Start isEmpty. Operand has 80 states, 52 states have (on average 1.4423076923076923) internal successors, (75), 53 states have internal predecessors, (75), 25 states have call successors, (25), 1 states have call predecessors, (25), 1 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) [2023-06-12 18:01:27,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-06-12 18:01:27,919 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:01:27,920 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:01:27,920 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:01:27,923 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:01:27,923 INFO L85 PathProgramCache]: Analyzing trace with hash 1071994359, now seen corresponding path program 1 times [2023-06-12 18:01:27,929 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:01:27,929 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [348132633] [2023-06-12 18:01:27,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:01:27,930 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:01:27,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:01:27,999 INFO L262 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 3 conjunts are in the unsatisfiable core [2023-06-12 18:01:28,003 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:01:28,064 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-06-12 18:01:28,064 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:01:28,065 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [348132633] [2023-06-12 18:01:28,065 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [348132633] provided 1 perfect and 0 imperfect interpolant sequences [2023-06-12 18:01:28,065 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-06-12 18:01:28,065 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-06-12 18:01:28,067 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1344418807] [2023-06-12 18:01:28,067 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-06-12 18:01:28,070 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-06-12 18:01:28,071 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:01:28,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-06-12 18:01:28,094 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-06-12 18:01:28,096 INFO L87 Difference]: Start difference. First operand has 80 states, 52 states have (on average 1.4423076923076923) internal successors, (75), 53 states have internal predecessors, (75), 25 states have call successors, (25), 1 states have call predecessors, (25), 1 states have return successors, (25), 25 states have call predecessors, (25), 25 states have call successors, (25) Second operand has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:28,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:01:28,391 INFO L93 Difference]: Finished difference Result 154 states and 244 transitions. [2023-06-12 18:01:28,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-06-12 18:01:28,394 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 8 [2023-06-12 18:01:28,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:01:28,410 INFO L225 Difference]: With dead ends: 154 [2023-06-12 18:01:28,410 INFO L226 Difference]: Without dead ends: 152 [2023-06-12 18:01:28,411 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-06-12 18:01:28,415 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 201 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 225 SdHoareTripleChecker+Valid, 178 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-06-12 18:01:28,419 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [225 Valid, 178 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-06-12 18:01:28,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2023-06-12 18:01:28,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 152. [2023-06-12 18:01:28,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 100 states have (on average 1.44) internal successors, (144), 100 states have internal predecessors, (144), 49 states have call successors, (49), 2 states have call predecessors, (49), 2 states have return successors, (49), 49 states have call predecessors, (49), 49 states have call successors, (49) [2023-06-12 18:01:28,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 242 transitions. [2023-06-12 18:01:28,481 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 242 transitions. Word has length 8 [2023-06-12 18:01:28,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:01:28,482 INFO L495 AbstractCegarLoop]: Abstraction has 152 states and 242 transitions. [2023-06-12 18:01:28,482 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.5) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:28,482 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 242 transitions. [2023-06-12 18:01:28,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-06-12 18:01:28,490 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:01:28,490 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:01:28,491 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-06-12 18:01:28,491 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:01:28,491 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:01:28,491 INFO L85 PathProgramCache]: Analyzing trace with hash 1188826747, now seen corresponding path program 1 times [2023-06-12 18:01:28,491 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:01:28,492 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [999880182] [2023-06-12 18:01:28,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:01:28,492 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:01:28,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:01:28,518 INFO L262 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 3 conjunts are in the unsatisfiable core [2023-06-12 18:01:28,519 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:01:28,533 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-06-12 18:01:28,534 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:01:28,534 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [999880182] [2023-06-12 18:01:28,535 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [999880182] provided 1 perfect and 0 imperfect interpolant sequences [2023-06-12 18:01:28,536 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-06-12 18:01:28,536 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-06-12 18:01:28,536 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599887145] [2023-06-12 18:01:28,536 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-06-12 18:01:28,537 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-06-12 18:01:28,538 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:01:28,538 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-06-12 18:01:28,538 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-06-12 18:01:28,539 INFO L87 Difference]: Start difference. First operand 152 states and 242 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:28,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:01:28,750 INFO L93 Difference]: Finished difference Result 242 states and 412 transitions. [2023-06-12 18:01:28,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-06-12 18:01:28,751 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2023-06-12 18:01:28,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:01:28,755 INFO L225 Difference]: With dead ends: 242 [2023-06-12 18:01:28,755 INFO L226 Difference]: Without dead ends: 242 [2023-06-12 18:01:28,755 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-06-12 18:01:28,756 INFO L413 NwaCegarLoop]: 186 mSDtfsCounter, 21 mSDsluCounter, 180 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 45 SdHoareTripleChecker+Valid, 366 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-06-12 18:01:28,757 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [45 Valid, 366 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-06-12 18:01:28,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 242 states. [2023-06-12 18:01:28,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 242 to 170. [2023-06-12 18:01:28,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 170 states, 118 states have (on average 1.6440677966101696) internal successors, (194), 118 states have internal predecessors, (194), 49 states have call successors, (49), 2 states have call predecessors, (49), 2 states have return successors, (49), 49 states have call predecessors, (49), 49 states have call successors, (49) [2023-06-12 18:01:28,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 292 transitions. [2023-06-12 18:01:28,774 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 292 transitions. Word has length 10 [2023-06-12 18:01:28,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:01:28,774 INFO L495 AbstractCegarLoop]: Abstraction has 170 states and 292 transitions. [2023-06-12 18:01:28,775 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:28,775 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 292 transitions. [2023-06-12 18:01:28,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-06-12 18:01:28,776 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:01:28,776 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:01:28,776 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-06-12 18:01:28,777 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:01:28,777 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:01:28,777 INFO L85 PathProgramCache]: Analyzing trace with hash 562084863, now seen corresponding path program 1 times [2023-06-12 18:01:28,777 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:01:28,777 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1368160176] [2023-06-12 18:01:28,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:01:28,778 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:01:28,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:01:28,786 INFO L262 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 3 conjunts are in the unsatisfiable core [2023-06-12 18:01:28,787 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:01:28,797 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-06-12 18:01:28,798 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:01:28,798 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1368160176] [2023-06-12 18:01:28,798 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [1368160176] provided 1 perfect and 0 imperfect interpolant sequences [2023-06-12 18:01:28,798 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-06-12 18:01:28,798 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-06-12 18:01:28,798 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [649967371] [2023-06-12 18:01:28,798 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-06-12 18:01:28,798 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-06-12 18:01:28,798 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:01:28,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-06-12 18:01:28,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-06-12 18:01:28,799 INFO L87 Difference]: Start difference. First operand 170 states and 292 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:28,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:01:28,964 INFO L93 Difference]: Finished difference Result 276 states and 478 transitions. [2023-06-12 18:01:28,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-06-12 18:01:28,979 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2023-06-12 18:01:28,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:01:28,984 INFO L225 Difference]: With dead ends: 276 [2023-06-12 18:01:28,984 INFO L226 Difference]: Without dead ends: 276 [2023-06-12 18:01:28,986 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-06-12 18:01:28,992 INFO L413 NwaCegarLoop]: 182 mSDtfsCounter, 29 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 192 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 386 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 192 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-06-12 18:01:28,993 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [53 Valid, 386 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 192 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-06-12 18:01:28,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2023-06-12 18:01:29,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 252. [2023-06-12 18:01:29,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 252 states, 168 states have (on average 1.6428571428571428) internal successors, (276), 168 states have internal predecessors, (276), 81 states have call successors, (81), 2 states have call predecessors, (81), 2 states have return successors, (81), 81 states have call predecessors, (81), 81 states have call successors, (81) [2023-06-12 18:01:29,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 252 states to 252 states and 438 transitions. [2023-06-12 18:01:29,022 INFO L78 Accepts]: Start accepts. Automaton has 252 states and 438 transitions. Word has length 10 [2023-06-12 18:01:29,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:01:29,022 INFO L495 AbstractCegarLoop]: Abstraction has 252 states and 438 transitions. [2023-06-12 18:01:29,023 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:29,023 INFO L276 IsEmpty]: Start isEmpty. Operand 252 states and 438 transitions. [2023-06-12 18:01:29,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-06-12 18:01:29,026 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:01:29,026 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:01:29,027 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-06-12 18:01:29,027 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:01:29,027 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:01:29,027 INFO L85 PathProgramCache]: Analyzing trace with hash -1522897474, now seen corresponding path program 1 times [2023-06-12 18:01:29,027 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:01:29,028 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1321241059] [2023-06-12 18:01:29,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:01:29,028 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:01:29,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:01:29,051 INFO L262 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2023-06-12 18:01:29,052 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:01:29,069 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-06-12 18:01:29,069 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:01:29,069 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1321241059] [2023-06-12 18:01:29,069 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [1321241059] provided 1 perfect and 0 imperfect interpolant sequences [2023-06-12 18:01:29,069 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-06-12 18:01:29,069 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-06-12 18:01:29,070 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [167582767] [2023-06-12 18:01:29,071 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-06-12 18:01:29,071 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-06-12 18:01:29,071 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:01:29,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-06-12 18:01:29,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-06-12 18:01:29,072 INFO L87 Difference]: Start difference. First operand 252 states and 438 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:29,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:01:29,261 INFO L93 Difference]: Finished difference Result 392 states and 720 transitions. [2023-06-12 18:01:29,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-06-12 18:01:29,262 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2023-06-12 18:01:29,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:01:29,273 INFO L225 Difference]: With dead ends: 392 [2023-06-12 18:01:29,273 INFO L226 Difference]: Without dead ends: 392 [2023-06-12 18:01:29,276 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-06-12 18:01:29,278 INFO L413 NwaCegarLoop]: 185 mSDtfsCounter, 23 mSDsluCounter, 179 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 364 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-06-12 18:01:29,278 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 364 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 202 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-06-12 18:01:29,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 392 states. [2023-06-12 18:01:29,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 392 to 272. [2023-06-12 18:01:29,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 188 states have (on average 1.9042553191489362) internal successors, (358), 188 states have internal predecessors, (358), 81 states have call successors, (81), 2 states have call predecessors, (81), 2 states have return successors, (81), 81 states have call predecessors, (81), 81 states have call successors, (81) [2023-06-12 18:01:29,316 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 520 transitions. [2023-06-12 18:01:29,317 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 520 transitions. Word has length 13 [2023-06-12 18:01:29,317 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:01:29,317 INFO L495 AbstractCegarLoop]: Abstraction has 272 states and 520 transitions. [2023-06-12 18:01:29,317 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:29,317 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 520 transitions. [2023-06-12 18:01:29,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-06-12 18:01:29,323 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:01:29,323 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:01:29,324 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-06-12 18:01:29,324 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:01:29,324 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:01:29,325 INFO L85 PathProgramCache]: Analyzing trace with hash -1360157184, now seen corresponding path program 1 times [2023-06-12 18:01:29,326 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:01:29,326 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [152655729] [2023-06-12 18:01:29,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:01:29,326 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:01:29,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:01:29,352 INFO L262 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 3 conjunts are in the unsatisfiable core [2023-06-12 18:01:29,352 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:01:29,365 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-06-12 18:01:29,366 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:01:29,366 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [152655729] [2023-06-12 18:01:29,366 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [152655729] provided 1 perfect and 0 imperfect interpolant sequences [2023-06-12 18:01:29,366 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-06-12 18:01:29,366 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-06-12 18:01:29,366 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [635562953] [2023-06-12 18:01:29,366 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-06-12 18:01:29,367 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-06-12 18:01:29,367 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:01:29,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-06-12 18:01:29,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-06-12 18:01:29,367 INFO L87 Difference]: Start difference. First operand 272 states and 520 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:29,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:01:29,516 INFO L93 Difference]: Finished difference Result 382 states and 770 transitions. [2023-06-12 18:01:29,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-06-12 18:01:29,517 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 13 [2023-06-12 18:01:29,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:01:29,524 INFO L225 Difference]: With dead ends: 382 [2023-06-12 18:01:29,524 INFO L226 Difference]: Without dead ends: 382 [2023-06-12 18:01:29,524 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-06-12 18:01:29,525 INFO L413 NwaCegarLoop]: 181 mSDtfsCounter, 31 mSDsluCounter, 203 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 384 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-06-12 18:01:29,525 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [55 Valid, 384 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 190 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-06-12 18:01:29,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 382 states. [2023-06-12 18:01:29,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 382 to 358. [2023-06-12 18:01:29,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 358 states, 242 states have (on average 2.0826446280991737) internal successors, (504), 242 states have internal predecessors, (504), 113 states have call successors, (113), 2 states have call predecessors, (113), 2 states have return successors, (113), 113 states have call predecessors, (113), 113 states have call successors, (113) [2023-06-12 18:01:29,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 358 states to 358 states and 730 transitions. [2023-06-12 18:01:29,548 INFO L78 Accepts]: Start accepts. Automaton has 358 states and 730 transitions. Word has length 13 [2023-06-12 18:01:29,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:01:29,548 INFO L495 AbstractCegarLoop]: Abstraction has 358 states and 730 transitions. [2023-06-12 18:01:29,549 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 4 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:29,549 INFO L276 IsEmpty]: Start isEmpty. Operand 358 states and 730 transitions. [2023-06-12 18:01:29,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-06-12 18:01:29,561 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:01:29,562 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:01:29,562 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-06-12 18:01:29,562 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:01:29,562 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:01:29,562 INFO L85 PathProgramCache]: Analyzing trace with hash 720527545, now seen corresponding path program 1 times [2023-06-12 18:01:29,562 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:01:29,563 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [208261331] [2023-06-12 18:01:29,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:01:29,563 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:01:29,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:01:29,585 INFO L262 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2023-06-12 18:01:29,586 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:01:29,601 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-06-12 18:01:29,601 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:01:29,601 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [208261331] [2023-06-12 18:01:29,601 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [208261331] provided 1 perfect and 0 imperfect interpolant sequences [2023-06-12 18:01:29,601 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-06-12 18:01:29,601 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-06-12 18:01:29,601 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1055881512] [2023-06-12 18:01:29,602 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-06-12 18:01:29,602 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-06-12 18:01:29,602 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:01:29,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-06-12 18:01:29,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-06-12 18:01:29,602 INFO L87 Difference]: Start difference. First operand 358 states and 730 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:29,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:01:29,782 INFO L93 Difference]: Finished difference Result 548 states and 1130 transitions. [2023-06-12 18:01:29,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-06-12 18:01:29,783 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2023-06-12 18:01:29,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:01:29,795 INFO L225 Difference]: With dead ends: 548 [2023-06-12 18:01:29,795 INFO L226 Difference]: Without dead ends: 548 [2023-06-12 18:01:29,796 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-06-12 18:01:29,796 INFO L413 NwaCegarLoop]: 184 mSDtfsCounter, 25 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 362 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-06-12 18:01:29,796 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [49 Valid, 362 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-06-12 18:01:29,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 548 states. [2023-06-12 18:01:29,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 548 to 380. [2023-06-12 18:01:29,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 380 states, 264 states have (on average 2.3636363636363638) internal successors, (624), 264 states have internal predecessors, (624), 113 states have call successors, (113), 2 states have call predecessors, (113), 2 states have return successors, (113), 113 states have call predecessors, (113), 113 states have call successors, (113) [2023-06-12 18:01:29,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 380 states to 380 states and 850 transitions. [2023-06-12 18:01:29,821 INFO L78 Accepts]: Start accepts. Automaton has 380 states and 850 transitions. Word has length 16 [2023-06-12 18:01:29,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:01:29,821 INFO L495 AbstractCegarLoop]: Abstraction has 380 states and 850 transitions. [2023-06-12 18:01:29,821 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:29,821 INFO L276 IsEmpty]: Start isEmpty. Operand 380 states and 850 transitions. [2023-06-12 18:01:29,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-06-12 18:01:29,832 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:01:29,832 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:01:29,832 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-06-12 18:01:29,832 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:01:29,833 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:01:29,833 INFO L85 PathProgramCache]: Analyzing trace with hash -147683195, now seen corresponding path program 1 times [2023-06-12 18:01:29,833 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:01:29,833 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [539333667] [2023-06-12 18:01:29,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:01:29,833 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:01:29,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:01:29,843 INFO L262 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2023-06-12 18:01:29,844 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:01:29,866 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-06-12 18:01:29,866 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:01:29,866 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [539333667] [2023-06-12 18:01:29,866 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [539333667] provided 1 perfect and 0 imperfect interpolant sequences [2023-06-12 18:01:29,866 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-06-12 18:01:29,866 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-06-12 18:01:29,866 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2121469804] [2023-06-12 18:01:29,867 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-06-12 18:01:29,867 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-06-12 18:01:29,867 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:01:29,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-06-12 18:01:29,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-06-12 18:01:29,867 INFO L87 Difference]: Start difference. First operand 380 states and 850 transitions. Second operand has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:30,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:01:30,009 INFO L93 Difference]: Finished difference Result 492 states and 1142 transitions. [2023-06-12 18:01:30,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-06-12 18:01:30,010 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2023-06-12 18:01:30,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:01:30,021 INFO L225 Difference]: With dead ends: 492 [2023-06-12 18:01:30,021 INFO L226 Difference]: Without dead ends: 492 [2023-06-12 18:01:30,021 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-06-12 18:01:30,022 INFO L413 NwaCegarLoop]: 180 mSDtfsCounter, 33 mSDsluCounter, 202 mSDsCounter, 0 mSdLazyCounter, 188 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 382 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 188 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-06-12 18:01:30,022 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [57 Valid, 382 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 188 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-06-12 18:01:30,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 492 states. [2023-06-12 18:01:30,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 492 to 468. [2023-06-12 18:01:30,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 468 states, 320 states have (on average 2.5375) internal successors, (812), 320 states have internal predecessors, (812), 145 states have call successors, (145), 2 states have call predecessors, (145), 2 states have return successors, (145), 145 states have call predecessors, (145), 145 states have call successors, (145) [2023-06-12 18:01:30,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 1102 transitions. [2023-06-12 18:01:30,044 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 1102 transitions. Word has length 16 [2023-06-12 18:01:30,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:01:30,044 INFO L495 AbstractCegarLoop]: Abstraction has 468 states and 1102 transitions. [2023-06-12 18:01:30,044 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.5) internal successors, (14), 4 states have internal predecessors, (14), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:30,044 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 1102 transitions. [2023-06-12 18:01:30,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-06-12 18:01:30,070 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:01:30,070 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:01:30,070 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2023-06-12 18:01:30,070 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:01:30,070 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:01:30,071 INFO L85 PathProgramCache]: Analyzing trace with hash 332497842, now seen corresponding path program 1 times [2023-06-12 18:01:30,071 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:01:30,071 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [751850211] [2023-06-12 18:01:30,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:01:30,071 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:01:30,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:01:30,082 INFO L262 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 3 conjunts are in the unsatisfiable core [2023-06-12 18:01:30,082 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:01:30,091 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-06-12 18:01:30,092 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:01:30,092 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [751850211] [2023-06-12 18:01:30,092 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [751850211] provided 1 perfect and 0 imperfect interpolant sequences [2023-06-12 18:01:30,092 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-06-12 18:01:30,092 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-06-12 18:01:30,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2062652032] [2023-06-12 18:01:30,092 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-06-12 18:01:30,092 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-06-12 18:01:30,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:01:30,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-06-12 18:01:30,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-06-12 18:01:30,093 INFO L87 Difference]: Start difference. First operand 468 states and 1102 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:30,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:01:30,259 INFO L93 Difference]: Finished difference Result 708 states and 1626 transitions. [2023-06-12 18:01:30,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-06-12 18:01:30,259 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2023-06-12 18:01:30,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:01:30,282 INFO L225 Difference]: With dead ends: 708 [2023-06-12 18:01:30,282 INFO L226 Difference]: Without dead ends: 708 [2023-06-12 18:01:30,283 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-06-12 18:01:30,284 INFO L413 NwaCegarLoop]: 183 mSDtfsCounter, 27 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 198 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 360 SdHoareTripleChecker+Invalid, 212 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 198 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-06-12 18:01:30,284 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 360 Invalid, 212 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 198 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-06-12 18:01:30,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 708 states. [2023-06-12 18:01:30,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 708 to 492. [2023-06-12 18:01:30,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 492 states, 344 states have (on average 2.8372093023255816) internal successors, (976), 344 states have internal predecessors, (976), 145 states have call successors, (145), 2 states have call predecessors, (145), 2 states have return successors, (145), 145 states have call predecessors, (145), 145 states have call successors, (145) [2023-06-12 18:01:30,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 492 states to 492 states and 1266 transitions. [2023-06-12 18:01:30,321 INFO L78 Accepts]: Start accepts. Automaton has 492 states and 1266 transitions. Word has length 19 [2023-06-12 18:01:30,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:01:30,321 INFO L495 AbstractCegarLoop]: Abstraction has 492 states and 1266 transitions. [2023-06-12 18:01:30,321 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:30,322 INFO L276 IsEmpty]: Start isEmpty. Operand 492 states and 1266 transitions. [2023-06-12 18:01:30,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-06-12 18:01:30,363 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:01:30,363 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:01:30,364 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-06-12 18:01:30,364 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:01:30,364 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:01:30,364 INFO L85 PathProgramCache]: Analyzing trace with hash -286713932, now seen corresponding path program 1 times [2023-06-12 18:01:30,364 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:01:30,365 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [248647149] [2023-06-12 18:01:30,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:01:30,365 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:01:30,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:01:30,397 INFO L262 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 3 conjunts are in the unsatisfiable core [2023-06-12 18:01:30,398 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:01:30,416 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-06-12 18:01:30,417 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:01:30,417 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [248647149] [2023-06-12 18:01:30,417 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [248647149] provided 1 perfect and 0 imperfect interpolant sequences [2023-06-12 18:01:30,417 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-06-12 18:01:30,417 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-06-12 18:01:30,417 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [7543813] [2023-06-12 18:01:30,417 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-06-12 18:01:30,417 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-06-12 18:01:30,417 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:01:30,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-06-12 18:01:30,418 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-06-12 18:01:30,418 INFO L87 Difference]: Start difference. First operand 492 states and 1266 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:30,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:01:30,582 INFO L93 Difference]: Finished difference Result 606 states and 1606 transitions. [2023-06-12 18:01:30,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-06-12 18:01:30,583 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2023-06-12 18:01:30,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:01:30,599 INFO L225 Difference]: With dead ends: 606 [2023-06-12 18:01:30,599 INFO L226 Difference]: Without dead ends: 606 [2023-06-12 18:01:30,599 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-06-12 18:01:30,600 INFO L413 NwaCegarLoop]: 179 mSDtfsCounter, 35 mSDsluCounter, 201 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 380 SdHoareTripleChecker+Invalid, 208 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-06-12 18:01:30,600 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 380 Invalid, 208 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-06-12 18:01:30,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 606 states. [2023-06-12 18:01:30,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 606 to 582. [2023-06-12 18:01:30,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 582 states, 402 states have (on average 3.014925373134328) internal successors, (1212), 402 states have internal predecessors, (1212), 177 states have call successors, (177), 2 states have call predecessors, (177), 2 states have return successors, (177), 177 states have call predecessors, (177), 177 states have call successors, (177) [2023-06-12 18:01:30,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 582 states to 582 states and 1566 transitions. [2023-06-12 18:01:30,632 INFO L78 Accepts]: Start accepts. Automaton has 582 states and 1566 transitions. Word has length 19 [2023-06-12 18:01:30,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:01:30,632 INFO L495 AbstractCegarLoop]: Abstraction has 582 states and 1566 transitions. [2023-06-12 18:01:30,632 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 4 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:30,632 INFO L276 IsEmpty]: Start isEmpty. Operand 582 states and 1566 transitions. [2023-06-12 18:01:30,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-06-12 18:01:30,705 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:01:30,705 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:01:30,706 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-06-12 18:01:30,706 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:01:30,706 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:01:30,706 INFO L85 PathProgramCache]: Analyzing trace with hash 2103173555, now seen corresponding path program 1 times [2023-06-12 18:01:30,706 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:01:30,706 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1981979238] [2023-06-12 18:01:30,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:01:30,706 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:01:30,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:01:30,722 INFO L262 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 17 conjunts are in the unsatisfiable core [2023-06-12 18:01:30,723 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:01:30,750 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-06-12 18:01:30,751 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:01:30,751 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1981979238] [2023-06-12 18:01:30,751 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [1981979238] provided 0 perfect and 1 imperfect interpolant sequences [2023-06-12 18:01:30,751 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-06-12 18:01:30,751 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2023-06-12 18:01:30,751 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022342985] [2023-06-12 18:01:30,751 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-06-12 18:01:30,751 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-06-12 18:01:30,751 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:01:30,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-06-12 18:01:30,752 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-06-12 18:01:30,752 INFO L87 Difference]: Start difference. First operand 582 states and 1566 transitions. Second operand has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:31,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:01:31,314 INFO L93 Difference]: Finished difference Result 1594 states and 4274 transitions. [2023-06-12 18:01:31,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-06-12 18:01:31,315 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 22 [2023-06-12 18:01:31,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:01:31,433 INFO L225 Difference]: With dead ends: 1594 [2023-06-12 18:01:31,433 INFO L226 Difference]: Without dead ends: 1594 [2023-06-12 18:01:31,433 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2023-06-12 18:01:31,434 INFO L413 NwaCegarLoop]: 241 mSDtfsCounter, 78 mSDsluCounter, 371 mSDsCounter, 0 mSdLazyCounter, 847 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 114 SdHoareTripleChecker+Valid, 612 SdHoareTripleChecker+Invalid, 908 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 847 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-06-12 18:01:31,435 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [114 Valid, 612 Invalid, 908 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 847 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-06-12 18:01:31,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1594 states. [2023-06-12 18:01:31,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1594 to 1422. [2023-06-12 18:01:31,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1422 states, 978 states have (on average 3.2024539877300615) internal successors, (3132), 978 states have internal predecessors, (3132), 441 states have call successors, (441), 2 states have call predecessors, (441), 2 states have return successors, (441), 441 states have call predecessors, (441), 441 states have call successors, (441) [2023-06-12 18:01:31,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1422 states to 1422 states and 4014 transitions. [2023-06-12 18:01:31,586 INFO L78 Accepts]: Start accepts. Automaton has 1422 states and 4014 transitions. Word has length 22 [2023-06-12 18:01:31,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:01:31,588 INFO L495 AbstractCegarLoop]: Abstraction has 1422 states and 4014 transitions. [2023-06-12 18:01:31,588 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.3333333333333335) internal successors, (20), 6 states have internal predecessors, (20), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:31,588 INFO L276 IsEmpty]: Start isEmpty. Operand 1422 states and 4014 transitions. [2023-06-12 18:01:31,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-06-12 18:01:31,883 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:01:31,883 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:01:31,883 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-06-12 18:01:31,883 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:01:31,884 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:01:31,884 INFO L85 PathProgramCache]: Analyzing trace with hash -1973013244, now seen corresponding path program 1 times [2023-06-12 18:01:31,884 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:01:31,884 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [12743946] [2023-06-12 18:01:31,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:01:31,884 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:01:31,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:01:31,901 INFO L262 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 3 conjunts are in the unsatisfiable core [2023-06-12 18:01:31,903 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:01:31,922 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-06-12 18:01:31,923 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:01:31,923 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [12743946] [2023-06-12 18:01:31,923 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [12743946] provided 1 perfect and 0 imperfect interpolant sequences [2023-06-12 18:01:31,923 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-06-12 18:01:31,923 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-06-12 18:01:31,923 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617835986] [2023-06-12 18:01:31,923 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-06-12 18:01:31,923 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-06-12 18:01:31,923 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:01:31,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-06-12 18:01:31,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-06-12 18:01:31,924 INFO L87 Difference]: Start difference. First operand 1422 states and 4014 transitions. Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-06-12 18:01:32,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:01:32,487 INFO L93 Difference]: Finished difference Result 2152 states and 5718 transitions. [2023-06-12 18:01:32,487 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-06-12 18:01:32,487 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2023-06-12 18:01:32,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:01:32,826 INFO L225 Difference]: With dead ends: 2152 [2023-06-12 18:01:32,827 INFO L226 Difference]: Without dead ends: 2152 [2023-06-12 18:01:32,827 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-06-12 18:01:32,827 INFO L413 NwaCegarLoop]: 169 mSDtfsCounter, 34 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 285 SdHoareTripleChecker+Invalid, 241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-06-12 18:01:32,828 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 285 Invalid, 241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 202 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-06-12 18:01:32,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2152 states. [2023-06-12 18:01:32,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2152 to 1432. [2023-06-12 18:01:32,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1432 states, 988 states have (on average 3.289473684210526) internal successors, (3250), 988 states have internal predecessors, (3250), 441 states have call successors, (441), 2 states have call predecessors, (441), 2 states have return successors, (441), 441 states have call predecessors, (441), 441 states have call successors, (441) [2023-06-12 18:01:33,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1432 states to 1432 states and 4132 transitions. [2023-06-12 18:01:33,042 INFO L78 Accepts]: Start accepts. Automaton has 1432 states and 4132 transitions. Word has length 27 [2023-06-12 18:01:33,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:01:33,043 INFO L495 AbstractCegarLoop]: Abstraction has 1432 states and 4132 transitions. [2023-06-12 18:01:33,043 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-06-12 18:01:33,043 INFO L276 IsEmpty]: Start isEmpty. Operand 1432 states and 4132 transitions. [2023-06-12 18:01:33,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-06-12 18:01:33,270 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:01:33,270 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:01:33,270 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-06-12 18:01:33,271 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:01:33,271 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:01:33,271 INFO L85 PathProgramCache]: Analyzing trace with hash 1675854076, now seen corresponding path program 1 times [2023-06-12 18:01:33,271 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:01:33,271 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [141441338] [2023-06-12 18:01:33,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:01:33,271 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:01:33,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:01:33,288 INFO L262 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 3 conjunts are in the unsatisfiable core [2023-06-12 18:01:33,290 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:01:33,304 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-06-12 18:01:33,304 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:01:33,304 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [141441338] [2023-06-12 18:01:33,304 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [141441338] provided 1 perfect and 0 imperfect interpolant sequences [2023-06-12 18:01:33,304 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-06-12 18:01:33,304 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-06-12 18:01:33,304 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77897231] [2023-06-12 18:01:33,305 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-06-12 18:01:33,305 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-06-12 18:01:33,305 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:01:33,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-06-12 18:01:33,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-06-12 18:01:33,305 INFO L87 Difference]: Start difference. First operand 1432 states and 4132 transitions. Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-06-12 18:01:33,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:01:33,601 INFO L93 Difference]: Finished difference Result 1714 states and 4914 transitions. [2023-06-12 18:01:33,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-06-12 18:01:33,601 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2023-06-12 18:01:33,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:01:33,755 INFO L225 Difference]: With dead ends: 1714 [2023-06-12 18:01:33,756 INFO L226 Difference]: Without dead ends: 1714 [2023-06-12 18:01:33,756 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-06-12 18:01:33,756 INFO L413 NwaCegarLoop]: 177 mSDtfsCounter, 35 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 209 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 57 SdHoareTripleChecker+Valid, 321 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 209 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-06-12 18:01:33,757 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [57 Valid, 321 Invalid, 243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 209 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-06-12 18:01:33,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1714 states. [2023-06-12 18:01:33,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1714 to 1432. [2023-06-12 18:01:33,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1432 states, 988 states have (on average 3.289473684210526) internal successors, (3250), 988 states have internal predecessors, (3250), 441 states have call successors, (441), 2 states have call predecessors, (441), 2 states have return successors, (441), 441 states have call predecessors, (441), 441 states have call successors, (441) [2023-06-12 18:01:34,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1432 states to 1432 states and 4132 transitions. [2023-06-12 18:01:34,039 INFO L78 Accepts]: Start accepts. Automaton has 1432 states and 4132 transitions. Word has length 27 [2023-06-12 18:01:34,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:01:34,039 INFO L495 AbstractCegarLoop]: Abstraction has 1432 states and 4132 transitions. [2023-06-12 18:01:34,040 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-06-12 18:01:34,040 INFO L276 IsEmpty]: Start isEmpty. Operand 1432 states and 4132 transitions. [2023-06-12 18:01:34,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-06-12 18:01:34,282 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:01:34,282 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:01:34,282 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-06-12 18:01:34,282 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:01:34,282 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:01:34,282 INFO L85 PathProgramCache]: Analyzing trace with hash 499462336, now seen corresponding path program 1 times [2023-06-12 18:01:34,283 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:01:34,283 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [528128887] [2023-06-12 18:01:34,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:01:34,283 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:01:34,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:01:34,290 INFO L262 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 3 conjunts are in the unsatisfiable core [2023-06-12 18:01:34,291 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:01:34,336 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-06-12 18:01:34,336 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:01:34,337 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [528128887] [2023-06-12 18:01:34,337 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [528128887] provided 1 perfect and 0 imperfect interpolant sequences [2023-06-12 18:01:34,337 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-06-12 18:01:34,337 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-06-12 18:01:34,337 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1407907689] [2023-06-12 18:01:34,337 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-06-12 18:01:34,337 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-06-12 18:01:34,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:01:34,338 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-06-12 18:01:34,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-06-12 18:01:34,338 INFO L87 Difference]: Start difference. First operand 1432 states and 4132 transitions. Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-06-12 18:01:34,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:01:34,677 INFO L93 Difference]: Finished difference Result 1936 states and 5618 transitions. [2023-06-12 18:01:34,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-06-12 18:01:34,677 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2023-06-12 18:01:34,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:01:34,825 INFO L225 Difference]: With dead ends: 1936 [2023-06-12 18:01:34,825 INFO L226 Difference]: Without dead ends: 1936 [2023-06-12 18:01:34,826 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-06-12 18:01:34,826 INFO L413 NwaCegarLoop]: 174 mSDtfsCounter, 39 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 205 mSolverCounterSat, 44 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 299 SdHoareTripleChecker+Invalid, 249 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 44 IncrementalHoareTripleChecker+Valid, 205 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-06-12 18:01:34,826 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 299 Invalid, 249 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [44 Valid, 205 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-06-12 18:01:34,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1936 states. [2023-06-12 18:01:34,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1936 to 1432. [2023-06-12 18:01:34,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1432 states, 988 states have (on average 3.289473684210526) internal successors, (3250), 988 states have internal predecessors, (3250), 441 states have call successors, (441), 2 states have call predecessors, (441), 2 states have return successors, (441), 441 states have call predecessors, (441), 441 states have call successors, (441) [2023-06-12 18:01:34,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1432 states to 1432 states and 4132 transitions. [2023-06-12 18:01:34,968 INFO L78 Accepts]: Start accepts. Automaton has 1432 states and 4132 transitions. Word has length 27 [2023-06-12 18:01:34,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:01:34,968 INFO L495 AbstractCegarLoop]: Abstraction has 1432 states and 4132 transitions. [2023-06-12 18:01:34,968 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 4 states have internal predecessors, (15), 2 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-06-12 18:01:34,968 INFO L276 IsEmpty]: Start isEmpty. Operand 1432 states and 4132 transitions. [2023-06-12 18:01:35,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-06-12 18:01:35,187 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:01:35,187 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:01:35,187 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-06-12 18:01:35,187 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:01:35,187 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:01:35,187 INFO L85 PathProgramCache]: Analyzing trace with hash 180954604, now seen corresponding path program 2 times [2023-06-12 18:01:35,187 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:01:35,188 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [324917310] [2023-06-12 18:01:35,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:01:35,188 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:01:35,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:01:35,197 INFO L262 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 3 conjunts are in the unsatisfiable core [2023-06-12 18:01:35,197 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:01:35,205 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-06-12 18:01:35,206 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:01:35,206 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [324917310] [2023-06-12 18:01:35,206 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [324917310] provided 1 perfect and 0 imperfect interpolant sequences [2023-06-12 18:01:35,206 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-06-12 18:01:35,206 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-06-12 18:01:35,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47008777] [2023-06-12 18:01:35,206 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-06-12 18:01:35,206 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-06-12 18:01:35,206 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:01:35,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-06-12 18:01:35,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-06-12 18:01:35,207 INFO L87 Difference]: Start difference. First operand 1432 states and 4132 transitions. Second operand has 4 states, 4 states have (on average 5.75) internal successors, (23), 4 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:35,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:01:35,757 INFO L93 Difference]: Finished difference Result 2222 states and 6164 transitions. [2023-06-12 18:01:35,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-06-12 18:01:35,758 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.75) internal successors, (23), 4 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2023-06-12 18:01:35,758 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:01:36,004 INFO L225 Difference]: With dead ends: 2222 [2023-06-12 18:01:36,004 INFO L226 Difference]: Without dead ends: 2222 [2023-06-12 18:01:36,004 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-06-12 18:01:36,005 INFO L413 NwaCegarLoop]: 137 mSDtfsCounter, 24 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 243 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-06-12 18:01:36,005 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [48 Valid, 243 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-06-12 18:01:36,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2222 states. [2023-06-12 18:01:36,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2222 to 1562. [2023-06-12 18:01:36,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1562 states, 1118 states have (on average 3.740608228980322) internal successors, (4182), 1118 states have internal predecessors, (4182), 441 states have call successors, (441), 2 states have call predecessors, (441), 2 states have return successors, (441), 441 states have call predecessors, (441), 441 states have call successors, (441) [2023-06-12 18:01:36,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1562 states to 1562 states and 5064 transitions. [2023-06-12 18:01:36,202 INFO L78 Accepts]: Start accepts. Automaton has 1562 states and 5064 transitions. Word has length 25 [2023-06-12 18:01:36,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:01:36,202 INFO L495 AbstractCegarLoop]: Abstraction has 1562 states and 5064 transitions. [2023-06-12 18:01:36,202 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.75) internal successors, (23), 4 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:36,202 INFO L276 IsEmpty]: Start isEmpty. Operand 1562 states and 5064 transitions. [2023-06-12 18:01:36,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-06-12 18:01:36,461 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:01:36,461 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:01:36,461 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-06-12 18:01:36,461 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:01:36,461 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:01:36,461 INFO L85 PathProgramCache]: Analyzing trace with hash 1719015704, now seen corresponding path program 3 times [2023-06-12 18:01:36,462 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:01:36,462 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [281914543] [2023-06-12 18:01:36,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:01:36,462 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:01:36,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:01:36,483 INFO L262 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 3 conjunts are in the unsatisfiable core [2023-06-12 18:01:36,487 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:01:36,499 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-06-12 18:01:36,500 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:01:36,500 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [281914543] [2023-06-12 18:01:36,500 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [281914543] provided 1 perfect and 0 imperfect interpolant sequences [2023-06-12 18:01:36,500 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-06-12 18:01:36,500 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-06-12 18:01:36,500 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209558868] [2023-06-12 18:01:36,500 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-06-12 18:01:36,500 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-06-12 18:01:36,500 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:01:36,501 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-06-12 18:01:36,501 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-06-12 18:01:36,501 INFO L87 Difference]: Start difference. First operand 1562 states and 5064 transitions. Second operand has 4 states, 4 states have (on average 5.75) internal successors, (23), 4 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:36,911 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:01:36,911 INFO L93 Difference]: Finished difference Result 2222 states and 6112 transitions. [2023-06-12 18:01:36,912 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-06-12 18:01:36,912 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.75) internal successors, (23), 4 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2023-06-12 18:01:36,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:01:37,235 INFO L225 Difference]: With dead ends: 2222 [2023-06-12 18:01:37,235 INFO L226 Difference]: Without dead ends: 2222 [2023-06-12 18:01:37,235 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-06-12 18:01:37,236 INFO L413 NwaCegarLoop]: 136 mSDtfsCounter, 26 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 320 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 241 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 320 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-06-12 18:01:37,236 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 241 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 320 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-06-12 18:01:37,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2222 states. [2023-06-12 18:01:37,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2222 to 1562. [2023-06-12 18:01:37,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1562 states, 1118 states have (on average 3.6940966010733454) internal successors, (4130), 1118 states have internal predecessors, (4130), 441 states have call successors, (441), 2 states have call predecessors, (441), 2 states have return successors, (441), 441 states have call predecessors, (441), 441 states have call successors, (441) [2023-06-12 18:01:37,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1562 states to 1562 states and 5012 transitions. [2023-06-12 18:01:37,431 INFO L78 Accepts]: Start accepts. Automaton has 1562 states and 5012 transitions. Word has length 25 [2023-06-12 18:01:37,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:01:37,432 INFO L495 AbstractCegarLoop]: Abstraction has 1562 states and 5012 transitions. [2023-06-12 18:01:37,432 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.75) internal successors, (23), 4 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:37,432 INFO L276 IsEmpty]: Start isEmpty. Operand 1562 states and 5012 transitions. [2023-06-12 18:01:37,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-06-12 18:01:37,592 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:01:37,592 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:01:37,592 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-06-12 18:01:37,593 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:01:37,593 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:01:37,593 INFO L85 PathProgramCache]: Analyzing trace with hash 646499514, now seen corresponding path program 1 times [2023-06-12 18:01:37,593 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:01:37,593 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1659112032] [2023-06-12 18:01:37,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:01:37,593 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:01:37,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:01:37,605 INFO L262 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 3 conjunts are in the unsatisfiable core [2023-06-12 18:01:37,605 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:01:37,615 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-06-12 18:01:37,616 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:01:37,616 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1659112032] [2023-06-12 18:01:37,616 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [1659112032] provided 1 perfect and 0 imperfect interpolant sequences [2023-06-12 18:01:37,616 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-06-12 18:01:37,616 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-06-12 18:01:37,616 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [491701563] [2023-06-12 18:01:37,616 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-06-12 18:01:37,616 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-06-12 18:01:37,616 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:01:37,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-06-12 18:01:37,617 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-06-12 18:01:37,617 INFO L87 Difference]: Start difference. First operand 1562 states and 5012 transitions. Second operand has 4 states, 4 states have (on average 5.75) internal successors, (23), 4 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:38,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:01:38,025 INFO L93 Difference]: Finished difference Result 2286 states and 7320 transitions. [2023-06-12 18:01:38,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-06-12 18:01:38,025 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.75) internal successors, (23), 4 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2023-06-12 18:01:38,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:01:38,389 INFO L225 Difference]: With dead ends: 2286 [2023-06-12 18:01:38,389 INFO L226 Difference]: Without dead ends: 2286 [2023-06-12 18:01:38,390 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-06-12 18:01:38,390 INFO L413 NwaCegarLoop]: 156 mSDtfsCounter, 34 mSDsluCounter, 165 mSDsCounter, 0 mSdLazyCounter, 248 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 321 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 248 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-06-12 18:01:38,390 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [58 Valid, 321 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 248 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-06-12 18:01:38,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2286 states. [2023-06-12 18:01:38,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2286 to 2226. [2023-06-12 18:01:38,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2226 states, 1542 states have (on average 3.7989623865110245) internal successors, (5858), 1542 states have internal predecessors, (5858), 681 states have call successors, (681), 2 states have call predecessors, (681), 2 states have return successors, (681), 681 states have call predecessors, (681), 681 states have call successors, (681) [2023-06-12 18:01:38,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2226 states to 2226 states and 7220 transitions. [2023-06-12 18:01:38,696 INFO L78 Accepts]: Start accepts. Automaton has 2226 states and 7220 transitions. Word has length 25 [2023-06-12 18:01:38,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:01:38,696 INFO L495 AbstractCegarLoop]: Abstraction has 2226 states and 7220 transitions. [2023-06-12 18:01:38,696 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.75) internal successors, (23), 4 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:38,696 INFO L276 IsEmpty]: Start isEmpty. Operand 2226 states and 7220 transitions. [2023-06-12 18:01:38,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-06-12 18:01:38,965 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:01:38,965 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:01:38,966 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2023-06-12 18:01:38,966 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:01:38,966 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:01:38,966 INFO L85 PathProgramCache]: Analyzing trace with hash -891561586, now seen corresponding path program 2 times [2023-06-12 18:01:38,966 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:01:38,966 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [705016296] [2023-06-12 18:01:38,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:01:38,967 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:01:38,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:01:38,976 INFO L262 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 3 conjunts are in the unsatisfiable core [2023-06-12 18:01:38,976 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:01:39,000 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 13 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-06-12 18:01:39,000 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:01:39,000 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [705016296] [2023-06-12 18:01:39,000 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [705016296] provided 1 perfect and 0 imperfect interpolant sequences [2023-06-12 18:01:39,000 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-06-12 18:01:39,000 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-06-12 18:01:39,000 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596783391] [2023-06-12 18:01:39,001 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-06-12 18:01:39,001 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-06-12 18:01:39,001 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:01:39,001 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-06-12 18:01:39,001 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-06-12 18:01:39,001 INFO L87 Difference]: Start difference. First operand 2226 states and 7220 transitions. Second operand has 4 states, 4 states have (on average 5.75) internal successors, (23), 4 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:39,460 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:01:39,460 INFO L93 Difference]: Finished difference Result 2286 states and 7244 transitions. [2023-06-12 18:01:39,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-06-12 18:01:39,461 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.75) internal successors, (23), 4 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 25 [2023-06-12 18:01:39,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:01:39,692 INFO L225 Difference]: With dead ends: 2286 [2023-06-12 18:01:39,692 INFO L226 Difference]: Without dead ends: 2286 [2023-06-12 18:01:39,692 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-06-12 18:01:39,693 INFO L413 NwaCegarLoop]: 157 mSDtfsCounter, 32 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 250 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 266 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 250 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-06-12 18:01:39,693 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 323 Invalid, 266 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 250 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-06-12 18:01:39,694 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2286 states. [2023-06-12 18:01:39,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2286 to 2174. [2023-06-12 18:01:39,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2174 states, 1490 states have (on average 3.648322147651007) internal successors, (5436), 1490 states have internal predecessors, (5436), 681 states have call successors, (681), 2 states have call predecessors, (681), 2 states have return successors, (681), 681 states have call predecessors, (681), 681 states have call successors, (681) [2023-06-12 18:01:39,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2174 states to 2174 states and 6798 transitions. [2023-06-12 18:01:39,932 INFO L78 Accepts]: Start accepts. Automaton has 2174 states and 6798 transitions. Word has length 25 [2023-06-12 18:01:39,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:01:39,932 INFO L495 AbstractCegarLoop]: Abstraction has 2174 states and 6798 transitions. [2023-06-12 18:01:39,932 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.75) internal successors, (23), 4 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:39,932 INFO L276 IsEmpty]: Start isEmpty. Operand 2174 states and 6798 transitions. [2023-06-12 18:01:40,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-06-12 18:01:40,421 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:01:40,421 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:01:40,421 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-06-12 18:01:40,421 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:01:40,422 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:01:40,422 INFO L85 PathProgramCache]: Analyzing trace with hash -555559135, now seen corresponding path program 1 times [2023-06-12 18:01:40,422 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:01:40,422 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [426985397] [2023-06-12 18:01:40,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:01:40,422 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:01:40,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:01:40,430 INFO L262 TraceCheckSpWp]: Trace formula consists of 165 conjuncts, 5 conjunts are in the unsatisfiable core [2023-06-12 18:01:40,430 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:01:40,471 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 15 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-06-12 18:01:40,471 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:01:40,471 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [426985397] [2023-06-12 18:01:40,471 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [426985397] provided 0 perfect and 1 imperfect interpolant sequences [2023-06-12 18:01:40,471 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-06-12 18:01:40,471 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2023-06-12 18:01:40,472 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094542037] [2023-06-12 18:01:40,472 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-06-12 18:01:40,472 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-06-12 18:01:40,472 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:01:40,472 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-06-12 18:01:40,472 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-06-12 18:01:40,472 INFO L87 Difference]: Start difference. First operand 2174 states and 6798 transitions. Second operand has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2023-06-12 18:01:41,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:01:41,798 INFO L93 Difference]: Finished difference Result 3245 states and 10265 transitions. [2023-06-12 18:01:41,798 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-06-12 18:01:41,798 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) Word has length 30 [2023-06-12 18:01:41,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:01:42,563 INFO L225 Difference]: With dead ends: 3245 [2023-06-12 18:01:42,563 INFO L226 Difference]: Without dead ends: 3187 [2023-06-12 18:01:42,564 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2023-06-12 18:01:42,566 INFO L413 NwaCegarLoop]: 154 mSDtfsCounter, 204 mSDsluCounter, 231 mSDsCounter, 0 mSdLazyCounter, 710 mSolverCounterSat, 173 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 328 SdHoareTripleChecker+Valid, 385 SdHoareTripleChecker+Invalid, 883 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 173 IncrementalHoareTripleChecker+Valid, 710 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-06-12 18:01:42,566 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [328 Valid, 385 Invalid, 883 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [173 Valid, 710 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-06-12 18:01:42,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3187 states. [2023-06-12 18:01:43,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3187 to 2839. [2023-06-12 18:01:43,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2839 states, 1770 states have (on average 3.6463276836158194) internal successors, (6454), 1939 states have internal predecessors, (6454), 1065 states have call successors, (1065), 2 states have call predecessors, (1065), 3 states have return successors, (1933), 897 states have call predecessors, (1933), 1065 states have call successors, (1933) [2023-06-12 18:01:43,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2839 states to 2839 states and 9452 transitions. [2023-06-12 18:01:43,467 INFO L78 Accepts]: Start accepts. Automaton has 2839 states and 9452 transitions. Word has length 30 [2023-06-12 18:01:43,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:01:43,467 INFO L495 AbstractCegarLoop]: Abstraction has 2839 states and 9452 transitions. [2023-06-12 18:01:43,468 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.5) internal successors, (21), 6 states have internal predecessors, (21), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2023-06-12 18:01:43,468 INFO L276 IsEmpty]: Start isEmpty. Operand 2839 states and 9452 transitions. [2023-06-12 18:01:44,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-06-12 18:01:44,218 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:01:44,218 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:01:44,218 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-06-12 18:01:44,218 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:01:44,218 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:01:44,218 INFO L85 PathProgramCache]: Analyzing trace with hash 764418893, now seen corresponding path program 1 times [2023-06-12 18:01:44,219 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:01:44,219 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1263223459] [2023-06-12 18:01:44,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:01:44,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:01:44,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:01:44,237 INFO L262 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 12 conjunts are in the unsatisfiable core [2023-06-12 18:01:44,238 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:01:44,284 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-06-12 18:01:44,284 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:01:44,284 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1263223459] [2023-06-12 18:01:44,284 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [1263223459] provided 0 perfect and 1 imperfect interpolant sequences [2023-06-12 18:01:44,284 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-06-12 18:01:44,285 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2023-06-12 18:01:44,285 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047312506] [2023-06-12 18:01:44,285 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-06-12 18:01:44,286 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-06-12 18:01:44,286 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:01:44,287 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-06-12 18:01:44,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-06-12 18:01:44,287 INFO L87 Difference]: Start difference. First operand 2839 states and 9452 transitions. Second operand has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:46,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:01:46,876 INFO L93 Difference]: Finished difference Result 6739 states and 22304 transitions. [2023-06-12 18:01:46,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-06-12 18:01:46,877 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2023-06-12 18:01:46,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:01:49,893 INFO L225 Difference]: With dead ends: 6739 [2023-06-12 18:01:49,894 INFO L226 Difference]: Without dead ends: 6739 [2023-06-12 18:01:49,894 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2023-06-12 18:01:49,894 INFO L413 NwaCegarLoop]: 145 mSDtfsCounter, 83 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 387 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 463 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 387 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-06-12 18:01:49,894 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [113 Valid, 270 Invalid, 463 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 387 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-06-12 18:01:49,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6739 states. [2023-06-12 18:01:51,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6739 to 5855. [2023-06-12 18:01:51,389 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5855 states, 3730 states have (on average 3.7056300268096516) internal successors, (13822), 3961 states have internal predecessors, (13822), 2121 states have call successors, (2121), 2 states have call predecessors, (2121), 3 states have return successors, (3941), 1891 states have call predecessors, (3941), 2121 states have call successors, (3941) [2023-06-12 18:01:52,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5855 states to 5855 states and 19884 transitions. [2023-06-12 18:01:52,813 INFO L78 Accepts]: Start accepts. Automaton has 5855 states and 19884 transitions. Word has length 28 [2023-06-12 18:01:52,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:01:52,813 INFO L495 AbstractCegarLoop]: Abstraction has 5855 states and 19884 transitions. [2023-06-12 18:01:52,814 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.333333333333333) internal successors, (26), 6 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:01:52,814 INFO L276 IsEmpty]: Start isEmpty. Operand 5855 states and 19884 transitions. [2023-06-12 18:01:54,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-06-12 18:01:54,073 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:01:54,073 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:01:54,074 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2023-06-12 18:01:54,074 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:01:54,074 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:01:54,074 INFO L85 PathProgramCache]: Analyzing trace with hash -818775015, now seen corresponding path program 2 times [2023-06-12 18:01:54,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:01:54,074 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1359297954] [2023-06-12 18:01:54,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:01:54,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:01:54,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:01:54,084 INFO L262 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 12 conjunts are in the unsatisfiable core [2023-06-12 18:01:54,085 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:01:54,135 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-06-12 18:01:54,135 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:01:54,135 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1359297954] [2023-06-12 18:01:54,135 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [1359297954] provided 0 perfect and 1 imperfect interpolant sequences [2023-06-12 18:01:54,135 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-06-12 18:01:54,135 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2023-06-12 18:01:54,135 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651336623] [2023-06-12 18:01:54,135 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-06-12 18:01:54,136 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-06-12 18:01:54,136 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:01:54,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-06-12 18:01:54,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2023-06-12 18:01:54,136 INFO L87 Difference]: Start difference. First operand 5855 states and 19884 transitions. Second operand has 8 states, 8 states have (on average 3.25) internal successors, (26), 8 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:02:01,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:02:01,726 INFO L93 Difference]: Finished difference Result 12331 states and 40962 transitions. [2023-06-12 18:02:01,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-06-12 18:02:01,727 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.25) internal successors, (26), 8 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 28 [2023-06-12 18:02:01,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:02:12,291 INFO L225 Difference]: With dead ends: 12331 [2023-06-12 18:02:12,291 INFO L226 Difference]: Without dead ends: 12331 [2023-06-12 18:02:12,291 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=130, Unknown=0, NotChecked=0, Total=210 [2023-06-12 18:02:12,292 INFO L413 NwaCegarLoop]: 140 mSDtfsCounter, 140 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 581 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 182 SdHoareTripleChecker+Valid, 326 SdHoareTripleChecker+Invalid, 722 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 581 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-06-12 18:02:12,292 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [182 Valid, 326 Invalid, 722 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 581 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-06-12 18:02:12,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12331 states. [2023-06-12 18:02:16,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12331 to 8087. [2023-06-12 18:02:16,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8087 states, 5166 states have (on average 3.657375145180023) internal successors, (18894), 5469 states have internal predecessors, (18894), 2917 states have call successors, (2917), 2 states have call predecessors, (2917), 3 states have return successors, (5417), 2615 states have call predecessors, (5417), 2917 states have call successors, (5417) [2023-06-12 18:02:18,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8087 states to 8087 states and 27228 transitions. [2023-06-12 18:02:18,356 INFO L78 Accepts]: Start accepts. Automaton has 8087 states and 27228 transitions. Word has length 28 [2023-06-12 18:02:18,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:02:18,356 INFO L495 AbstractCegarLoop]: Abstraction has 8087 states and 27228 transitions. [2023-06-12 18:02:18,356 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.25) internal successors, (26), 8 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:02:18,356 INFO L276 IsEmpty]: Start isEmpty. Operand 8087 states and 27228 transitions. [2023-06-12 18:02:21,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-06-12 18:02:21,265 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:02:21,265 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:02:21,265 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2023-06-12 18:02:21,265 INFO L420 AbstractCegarLoop]: === Iteration 21 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:02:21,266 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:02:21,266 INFO L85 PathProgramCache]: Analyzing trace with hash 1322116696, now seen corresponding path program 1 times [2023-06-12 18:02:21,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:02:21,266 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1804307430] [2023-06-12 18:02:21,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:02:21,266 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:02:21,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:02:21,276 INFO L262 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 5 conjunts are in the unsatisfiable core [2023-06-12 18:02:21,277 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:02:21,299 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 21 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-06-12 18:02:21,300 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:02:21,300 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1804307430] [2023-06-12 18:02:21,300 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [1804307430] provided 0 perfect and 1 imperfect interpolant sequences [2023-06-12 18:02:21,300 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-06-12 18:02:21,300 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2023-06-12 18:02:21,300 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779226921] [2023-06-12 18:02:21,300 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-06-12 18:02:21,300 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-06-12 18:02:21,300 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:02:21,301 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-06-12 18:02:21,301 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-06-12 18:02:21,301 INFO L87 Difference]: Start difference. First operand 8087 states and 27228 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2023-06-12 18:02:30,473 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:02:30,473 INFO L93 Difference]: Finished difference Result 11319 states and 33102 transitions. [2023-06-12 18:02:30,473 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-06-12 18:02:30,473 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) Word has length 33 [2023-06-12 18:02:30,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:02:41,877 INFO L225 Difference]: With dead ends: 11319 [2023-06-12 18:02:41,877 INFO L226 Difference]: Without dead ends: 11319 [2023-06-12 18:02:41,878 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2023-06-12 18:02:41,878 INFO L413 NwaCegarLoop]: 115 mSDtfsCounter, 194 mSDsluCounter, 208 mSDsCounter, 0 mSdLazyCounter, 658 mSolverCounterSat, 172 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 318 SdHoareTripleChecker+Valid, 323 SdHoareTripleChecker+Invalid, 830 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 172 IncrementalHoareTripleChecker+Valid, 658 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-06-12 18:02:41,878 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [318 Valid, 323 Invalid, 830 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [172 Valid, 658 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-06-12 18:02:41,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11319 states. [2023-06-12 18:02:46,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11319 to 9237. [2023-06-12 18:02:46,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9237 states, 5166 states have (on average 3.657375145180023) internal successors, (18894), 6231 states have internal predecessors, (18894), 4067 states have call successors, (4067), 2 states have call predecessors, (4067), 3 states have return successors, (6567), 3003 states have call predecessors, (6567), 4067 states have call successors, (6567) [2023-06-12 18:02:50,508 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9237 states to 9237 states and 29528 transitions. [2023-06-12 18:02:50,509 INFO L78 Accepts]: Start accepts. Automaton has 9237 states and 29528 transitions. Word has length 33 [2023-06-12 18:02:50,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:02:50,509 INFO L495 AbstractCegarLoop]: Abstraction has 9237 states and 29528 transitions. [2023-06-12 18:02:50,509 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3) [2023-06-12 18:02:50,509 INFO L276 IsEmpty]: Start isEmpty. Operand 9237 states and 29528 transitions. [2023-06-12 18:02:54,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-06-12 18:02:54,526 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:02:54,526 INFO L195 NwaCegarLoop]: trace histogram [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] [2023-06-12 18:02:54,526 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2023-06-12 18:02:54,527 INFO L420 AbstractCegarLoop]: === Iteration 22 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:02:54,527 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:02:54,527 INFO L85 PathProgramCache]: Analyzing trace with hash 1474927772, now seen corresponding path program 3 times [2023-06-12 18:02:54,527 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:02:54,527 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [853736297] [2023-06-12 18:02:54,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:02:54,527 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:02:54,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:02:54,536 INFO L262 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 3 conjunts are in the unsatisfiable core [2023-06-12 18:02:54,537 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:02:54,545 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 21 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-06-12 18:02:54,546 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:02:54,546 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [853736297] [2023-06-12 18:02:54,546 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [853736297] provided 1 perfect and 0 imperfect interpolant sequences [2023-06-12 18:02:54,546 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-06-12 18:02:54,546 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-06-12 18:02:54,546 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845224356] [2023-06-12 18:02:54,546 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-06-12 18:02:54,546 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-06-12 18:02:54,546 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:02:54,547 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-06-12 18:02:54,547 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-06-12 18:02:54,547 INFO L87 Difference]: Start difference. First operand 9237 states and 29528 transitions. Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:03:07,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-06-12 18:03:07,516 INFO L93 Difference]: Finished difference Result 13301 states and 38715 transitions. [2023-06-12 18:03:07,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-06-12 18:03:07,518 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 31 [2023-06-12 18:03:07,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-06-12 18:03:23,259 INFO L225 Difference]: With dead ends: 13301 [2023-06-12 18:03:23,259 INFO L226 Difference]: Without dead ends: 13301 [2023-06-12 18:03:23,259 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-06-12 18:03:23,260 INFO L413 NwaCegarLoop]: 135 mSDtfsCounter, 28 mSDsluCounter, 104 mSDsCounter, 0 mSdLazyCounter, 318 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 239 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 318 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-06-12 18:03:23,260 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 239 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 318 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-06-12 18:03:23,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13301 states. [2023-06-12 18:03:29,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13301 to 9237. [2023-06-12 18:03:29,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9237 states, 5166 states have (on average 3.626984126984127) internal successors, (18737), 6231 states have internal predecessors, (18737), 4067 states have call successors, (4067), 2 states have call predecessors, (4067), 3 states have return successors, (6567), 3003 states have call predecessors, (6567), 4067 states have call successors, (6567) [2023-06-12 18:03:34,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9237 states to 9237 states and 29371 transitions. [2023-06-12 18:03:34,166 INFO L78 Accepts]: Start accepts. Automaton has 9237 states and 29371 transitions. Word has length 31 [2023-06-12 18:03:34,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-06-12 18:03:34,166 INFO L495 AbstractCegarLoop]: Abstraction has 9237 states and 29371 transitions. [2023-06-12 18:03:34,166 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-06-12 18:03:34,166 INFO L276 IsEmpty]: Start isEmpty. Operand 9237 states and 29371 transitions. [2023-06-12 18:03:37,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-06-12 18:03:37,960 INFO L187 NwaCegarLoop]: Found error trace [2023-06-12 18:03:37,960 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-06-12 18:03:37,961 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2023-06-12 18:03:37,961 INFO L420 AbstractCegarLoop]: === Iteration 23 === Targeting Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY === [Ultimate.STARTErr0ASSERT_VIOLATIONCHC_SATISFIABILITY] === [2023-06-12 18:03:37,962 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-06-12 18:03:37,962 INFO L85 PathProgramCache]: Analyzing trace with hash -1576850040, now seen corresponding path program 1 times [2023-06-12 18:03:37,962 INFO L118 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2023-06-12 18:03:37,963 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [68835496] [2023-06-12 18:03:37,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-06-12 18:03:37,963 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-06-12 18:03:38,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-06-12 18:03:38,013 INFO L262 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 5 conjunts are in the unsatisfiable core [2023-06-12 18:03:38,014 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-06-12 18:03:38,056 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 21 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-06-12 18:03:38,056 INFO L136 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2023-06-12 18:03:38,056 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [68835496] [2023-06-12 18:03:38,057 INFO L158 FreeRefinementEngine]: IpTcStrategyModulePreferences [68835496] provided 0 perfect and 1 imperfect interpolant sequences [2023-06-12 18:03:38,057 INFO L185 FreeRefinementEngine]: Found 0 perfect and 1 imperfect interpolant sequences. [2023-06-12 18:03:38,057 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2023-06-12 18:03:38,057 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245225778] [2023-06-12 18:03:38,057 INFO L85 oduleStraightlineAll]: Using 1 imperfect interpolants to construct interpolant automaton [2023-06-12 18:03:38,057 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-06-12 18:03:38,057 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2023-06-12 18:03:38,057 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-06-12 18:03:38,057 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-06-12 18:03:38,058 INFO L87 Difference]: Start difference. First operand 9237 states and 29371 transitions. Second operand has 6 states, 6 states have (on average 4.0) internal successors, (24), 6 states have internal predecessors, (24), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 1 states have call predecessors, (3), 3 states have call successors, (3)