/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -s ../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe.epf -tc ../../../trunk/examples/toolchains/AutomizerBplInline.xml -i ../../../trunk/examples/concurrent/bpl/regression/showcase/Fischer.bpl -------------------------------------------------------------------------------- This is Ultimate 0.2.1-9bbddad6b14272d9691b7fb6f1c011d15ab18596-9bbddad [2021-06-12 18:54:38,540 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-06-12 18:54:38,543 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-06-12 18:54:38,581 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-06-12 18:54:38,581 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-06-12 18:54:38,585 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-06-12 18:54:38,587 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-06-12 18:54:38,592 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-06-12 18:54:38,594 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-06-12 18:54:38,598 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-06-12 18:54:38,599 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-06-12 18:54:38,600 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-06-12 18:54:38,600 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-06-12 18:54:38,602 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-06-12 18:54:38,605 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-06-12 18:54:38,606 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-06-12 18:54:38,609 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-06-12 18:54:38,610 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-06-12 18:54:38,612 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-06-12 18:54:38,617 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-06-12 18:54:38,618 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-06-12 18:54:38,619 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-06-12 18:54:38,620 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-06-12 18:54:38,622 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-06-12 18:54:38,628 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-06-12 18:54:38,629 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-06-12 18:54:38,629 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-06-12 18:54:38,630 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-06-12 18:54:38,631 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-06-12 18:54:38,631 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-06-12 18:54:38,632 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-06-12 18:54:38,632 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-06-12 18:54:38,633 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-06-12 18:54:38,634 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-06-12 18:54:38,635 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-06-12 18:54:38,635 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-06-12 18:54:38,636 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-06-12 18:54:38,636 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-06-12 18:54:38,636 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-06-12 18:54:38,637 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-06-12 18:54:38,637 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-06-12 18:54:38,641 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/concurrent/svcomp-Reach-32bit-Automizer_Default-noMmResRef-FA-NoLbe.epf [2021-06-12 18:54:38,676 INFO L113 SettingsManager]: Loading preferences was successful [2021-06-12 18:54:38,676 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-06-12 18:54:38,677 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-06-12 18:54:38,677 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-06-12 18:54:38,679 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-06-12 18:54:38,679 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-06-12 18:54:38,679 INFO L138 SettingsManager]: * Use SBE=true [2021-06-12 18:54:38,680 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-06-12 18:54:38,680 INFO L138 SettingsManager]: * sizeof long=4 [2021-06-12 18:54:38,680 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-06-12 18:54:38,681 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-06-12 18:54:38,681 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-06-12 18:54:38,681 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-06-12 18:54:38,681 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-06-12 18:54:38,682 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-06-12 18:54:38,682 INFO L138 SettingsManager]: * sizeof long double=12 [2021-06-12 18:54:38,682 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-06-12 18:54:38,682 INFO L138 SettingsManager]: * Use constant arrays=true [2021-06-12 18:54:38,682 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-06-12 18:54:38,682 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-06-12 18:54:38,683 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-06-12 18:54:38,683 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-06-12 18:54:38,683 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-06-12 18:54:38,683 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-06-12 18:54:38,683 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-06-12 18:54:38,683 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-06-12 18:54:38,684 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-06-12 18:54:38,684 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-06-12 18:54:38,684 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-06-12 18:54:38,684 INFO L138 SettingsManager]: * Large block encoding in concurrent analysis=OFF [2021-06-12 18:54:38,684 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-06-12 18:54:38,684 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-06-12 18:54:39,034 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-06-12 18:54:39,055 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-06-12 18:54:39,057 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-06-12 18:54:39,058 INFO L271 PluginConnector]: Initializing Boogie PL CUP Parser... [2021-06-12 18:54:39,060 INFO L275 PluginConnector]: Boogie PL CUP Parser initialized [2021-06-12 18:54:39,060 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/showcase/Fischer.bpl [2021-06-12 18:54:39,061 INFO L110 BoogieParser]: Parsing: '/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/concurrent/bpl/regression/showcase/Fischer.bpl' [2021-06-12 18:54:39,096 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-06-12 18:54:39,097 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-06-12 18:54:39,098 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-06-12 18:54:39,099 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-06-12 18:54:39,099 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-06-12 18:54:39,111 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "Fischer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 06:54:39" (1/1) ... [2021-06-12 18:54:39,120 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "Fischer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 06:54:39" (1/1) ... [2021-06-12 18:54:39,127 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-06-12 18:54:39,129 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-06-12 18:54:39,130 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-06-12 18:54:39,130 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-06-12 18:54:39,137 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "Fischer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 06:54:39" (1/1) ... [2021-06-12 18:54:39,138 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "Fischer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 06:54:39" (1/1) ... [2021-06-12 18:54:39,139 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "Fischer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 06:54:39" (1/1) ... [2021-06-12 18:54:39,139 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "Fischer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 06:54:39" (1/1) ... [2021-06-12 18:54:39,142 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "Fischer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 06:54:39" (1/1) ... [2021-06-12 18:54:39,147 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "Fischer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 06:54:39" (1/1) ... [2021-06-12 18:54:39,148 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "Fischer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 06:54:39" (1/1) ... [2021-06-12 18:54:39,149 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-06-12 18:54:39,150 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-06-12 18:54:39,150 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-06-12 18:54:39,150 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-06-12 18:54:39,153 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "Fischer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 06:54:39" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-06-12 18:54:39,232 INFO L124 BoogieDeclarations]: Specification and implementation of procedure Process2 given in one single declaration [2021-06-12 18:54:39,233 INFO L130 BoogieDeclarations]: Found specification of procedure Process2 [2021-06-12 18:54:39,233 INFO L138 BoogieDeclarations]: Found implementation of procedure Process2 [2021-06-12 18:54:39,233 INFO L124 BoogieDeclarations]: Specification and implementation of procedure Process1 given in one single declaration [2021-06-12 18:54:39,233 INFO L130 BoogieDeclarations]: Found specification of procedure Process1 [2021-06-12 18:54:39,233 INFO L138 BoogieDeclarations]: Found implementation of procedure Process1 [2021-06-12 18:54:39,234 INFO L124 BoogieDeclarations]: Specification and implementation of procedure ULTIMATE.start given in one single declaration [2021-06-12 18:54:39,234 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-06-12 18:54:39,234 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-06-12 18:54:39,234 INFO L124 BoogieDeclarations]: Specification and implementation of procedure Clock given in one single declaration [2021-06-12 18:54:39,235 INFO L130 BoogieDeclarations]: Found specification of procedure Clock [2021-06-12 18:54:39,235 INFO L138 BoogieDeclarations]: Found implementation of procedure Clock [2021-06-12 18:54:39,236 WARN L209 CfgBuilder]: User set CodeBlockSize to SequenceOfStatements but program contains fork statements. Overwriting the user preferences and setting CodeBlockSize to SingleStatement [2021-06-12 18:54:39,436 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-06-12 18:54:39,437 INFO L299 CfgBuilder]: Removed 3 assume(true) statements. [2021-06-12 18:54:39,438 INFO L202 PluginConnector]: Adding new model Fischer.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.06 06:54:39 BoogieIcfgContainer [2021-06-12 18:54:39,438 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-06-12 18:54:39,440 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-06-12 18:54:39,440 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-06-12 18:54:39,442 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-06-12 18:54:39,443 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "Fischer.bpl de.uni_freiburg.informatik.ultimate.boogie.parser AST 12.06 06:54:39" (1/2) ... [2021-06-12 18:54:39,444 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@54e42394 and model type Fischer.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.06 06:54:39, skipping insertion in model container [2021-06-12 18:54:39,444 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "Fischer.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.06 06:54:39" (2/2) ... [2021-06-12 18:54:39,445 INFO L111 eAbstractionObserver]: Analyzing ICFG Fischer.bpl [2021-06-12 18:54:39,449 WARN L148 ceAbstractionStarter]: Switching off computation of Hoare annotation because input is a concurrent program [2021-06-12 18:54:39,450 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-06-12 18:54:39,450 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-06-12 18:54:39,450 INFO L471 ceAbstractionStarter]: Constructing petrified ICFG for 1 thread instances. [2021-06-12 18:54:39,470 WARN L313 ript$VariableManager]: TermVariabe Process2Thread1of1ForFork2_deadline not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-12 18:54:39,470 WARN L313 ript$VariableManager]: TermVariabe Process2Thread1of1ForFork2_deadline not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-12 18:54:39,471 WARN L313 ript$VariableManager]: TermVariabe Process2Thread1of1ForFork2_deadline not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-12 18:54:39,471 WARN L313 ript$VariableManager]: TermVariabe Process2Thread1of1ForFork2_deadline not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-12 18:54:39,471 WARN L313 ript$VariableManager]: TermVariabe Process2Thread1of1ForFork2_deadline not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-12 18:54:39,471 WARN L313 ript$VariableManager]: TermVariabe Process2Thread1of1ForFork2_deadline not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-12 18:54:39,472 WARN L313 ript$VariableManager]: TermVariabe Process2Thread1of1ForFork2_deadline not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-12 18:54:39,472 WARN L313 ript$VariableManager]: TermVariabe Process2Thread1of1ForFork2_deadline not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-12 18:54:39,473 WARN L313 ript$VariableManager]: TermVariabe Process1Thread1of1ForFork1_deadline not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-12 18:54:39,473 WARN L313 ript$VariableManager]: TermVariabe Process1Thread1of1ForFork1_deadline not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-12 18:54:39,474 WARN L313 ript$VariableManager]: TermVariabe Process1Thread1of1ForFork1_deadline not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-12 18:54:39,474 WARN L313 ript$VariableManager]: TermVariabe Process1Thread1of1ForFork1_deadline not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-12 18:54:39,474 WARN L313 ript$VariableManager]: TermVariabe Process1Thread1of1ForFork1_deadline not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-12 18:54:39,474 WARN L313 ript$VariableManager]: TermVariabe Process1Thread1of1ForFork1_deadline not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-12 18:54:39,475 WARN L313 ript$VariableManager]: TermVariabe Process1Thread1of1ForFork1_deadline not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-12 18:54:39,475 WARN L313 ript$VariableManager]: TermVariabe Process1Thread1of1ForFork1_deadline not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-12 18:54:39,479 WARN L313 ript$VariableManager]: TermVariabe Process1Thread1of1ForFork1_deadline not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-12 18:54:39,481 WARN L313 ript$VariableManager]: TermVariabe Process2Thread1of1ForFork2_deadline not constructed by VariableManager. Cannot ensure absence of name clashes. [2021-06-12 18:54:39,482 INFO L149 ThreadInstanceAdder]: Constructed 0 joinOtherThreadTransitions. [2021-06-12 18:54:39,499 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-06-12 18:54:39,515 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-12 18:54:39,516 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-12 18:54:39,516 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-12 18:54:39,516 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-12 18:54:39,516 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-12 18:54:39,516 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-12 18:54:39,516 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-12 18:54:39,516 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == Process2Thread1of1ForFork2======== [2021-06-12 18:54:39,525 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 51 places, 46 transitions, 107 flow [2021-06-12 18:54:39,719 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 1403 states, 1399 states have (on average 3.6125804145818443) internal successors, (5054), 1402 states have internal predecessors, (5054), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:39,725 INFO L276 IsEmpty]: Start isEmpty. Operand has 1403 states, 1399 states have (on average 3.6125804145818443) internal successors, (5054), 1402 states have internal predecessors, (5054), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:39,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-06-12 18:54:39,739 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 18:54:39,739 INFO L472 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 18:54:39,740 INFO L430 AbstractCegarLoop]: === Iteration 1 === [Process2Err0ASSERT_VIOLATIONASSERT]=== [2021-06-12 18:54:39,748 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 18:54:39,748 INFO L82 PathProgramCache]: Analyzing trace with hash -173258256, now seen corresponding path program 1 times [2021-06-12 18:54:39,755 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 18:54:39,756 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [296199535] [2021-06-12 18:54:39,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 18:54:39,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 18:54:39,880 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 18:54:39,880 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 18:54:39,881 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [296199535] [2021-06-12 18:54:39,882 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [296199535] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-12 18:54:39,882 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-12 18:54:39,882 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-06-12 18:54:39,883 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1481423335] [2021-06-12 18:54:39,886 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-06-12 18:54:39,887 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 18:54:39,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-06-12 18:54:39,903 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 18:54:39,908 INFO L87 Difference]: Start difference. First operand has 1403 states, 1399 states have (on average 3.6125804145818443) internal successors, (5054), 1402 states have internal predecessors, (5054), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:39,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 18:54:39,984 INFO L93 Difference]: Finished difference Result 398 states and 1386 transitions. [2021-06-12 18:54:39,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-06-12 18:54:39,991 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-06-12 18:54:39,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 18:54:40,012 INFO L225 Difference]: With dead ends: 398 [2021-06-12 18:54:40,013 INFO L226 Difference]: Without dead ends: 374 [2021-06-12 18:54:40,014 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 11.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 18:54:40,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2021-06-12 18:54:40,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 350. [2021-06-12 18:54:40,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 350 states, 350 states have (on average 3.5314285714285716) internal successors, (1236), 349 states have internal predecessors, (1236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 1236 transitions. [2021-06-12 18:54:40,109 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 1236 transitions. Word has length 9 [2021-06-12 18:54:40,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 18:54:40,110 INFO L482 AbstractCegarLoop]: Abstraction has 350 states and 1236 transitions. [2021-06-12 18:54:40,110 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 2 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,110 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 1236 transitions. [2021-06-12 18:54:40,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-06-12 18:54:40,113 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 18:54:40,113 INFO L472 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 18:54:40,113 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-06-12 18:54:40,114 INFO L430 AbstractCegarLoop]: === Iteration 2 === [Process2Err0ASSERT_VIOLATIONASSERT]=== [2021-06-12 18:54:40,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 18:54:40,117 INFO L82 PathProgramCache]: Analyzing trace with hash 403762029, now seen corresponding path program 1 times [2021-06-12 18:54:40,117 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 18:54:40,118 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [668523584] [2021-06-12 18:54:40,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 18:54:40,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 18:54:40,157 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 18:54:40,157 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 18:54:40,157 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [668523584] [2021-06-12 18:54:40,157 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [668523584] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-12 18:54:40,158 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-12 18:54:40,158 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-06-12 18:54:40,158 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858562571] [2021-06-12 18:54:40,161 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-06-12 18:54:40,162 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 18:54:40,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-06-12 18:54:40,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 18:54:40,164 INFO L87 Difference]: Start difference. First operand 350 states and 1236 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 18:54:40,224 INFO L93 Difference]: Finished difference Result 569 states and 1978 transitions. [2021-06-12 18:54:40,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-06-12 18:54:40,225 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-06-12 18:54:40,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 18:54:40,228 INFO L225 Difference]: With dead ends: 569 [2021-06-12 18:54:40,229 INFO L226 Difference]: Without dead ends: 473 [2021-06-12 18:54:40,229 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.3ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 18:54:40,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 473 states. [2021-06-12 18:54:40,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 473 to 359. [2021-06-12 18:54:40,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 359 states, 359 states have (on average 3.367688022284123) internal successors, (1209), 358 states have internal predecessors, (1209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359 states to 359 states and 1209 transitions. [2021-06-12 18:54:40,255 INFO L78 Accepts]: Start accepts. Automaton has 359 states and 1209 transitions. Word has length 12 [2021-06-12 18:54:40,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 18:54:40,256 INFO L482 AbstractCegarLoop]: Abstraction has 359 states and 1209 transitions. [2021-06-12 18:54:40,256 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,256 INFO L276 IsEmpty]: Start isEmpty. Operand 359 states and 1209 transitions. [2021-06-12 18:54:40,261 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-06-12 18:54:40,261 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 18:54:40,261 INFO L472 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 18:54:40,261 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-06-12 18:54:40,261 INFO L430 AbstractCegarLoop]: === Iteration 3 === [Process2Err0ASSERT_VIOLATIONASSERT]=== [2021-06-12 18:54:40,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 18:54:40,262 INFO L82 PathProgramCache]: Analyzing trace with hash 1014496749, now seen corresponding path program 2 times [2021-06-12 18:54:40,263 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 18:54:40,263 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2130964969] [2021-06-12 18:54:40,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 18:54:40,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 18:54:40,301 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 18:54:40,302 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 18:54:40,302 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2130964969] [2021-06-12 18:54:40,302 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2130964969] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-12 18:54:40,302 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-12 18:54:40,302 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-06-12 18:54:40,303 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1004659623] [2021-06-12 18:54:40,303 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-06-12 18:54:40,303 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 18:54:40,303 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-06-12 18:54:40,304 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 18:54:40,304 INFO L87 Difference]: Start difference. First operand 359 states and 1209 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 18:54:40,336 INFO L93 Difference]: Finished difference Result 461 states and 1548 transitions. [2021-06-12 18:54:40,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-06-12 18:54:40,337 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-06-12 18:54:40,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 18:54:40,340 INFO L225 Difference]: With dead ends: 461 [2021-06-12 18:54:40,340 INFO L226 Difference]: Without dead ends: 461 [2021-06-12 18:54:40,340 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 3.4ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 18:54:40,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2021-06-12 18:54:40,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 415. [2021-06-12 18:54:40,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 415 states, 415 states have (on average 3.346987951807229) internal successors, (1389), 414 states have internal predecessors, (1389), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,360 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 415 states to 415 states and 1389 transitions. [2021-06-12 18:54:40,361 INFO L78 Accepts]: Start accepts. Automaton has 415 states and 1389 transitions. Word has length 12 [2021-06-12 18:54:40,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 18:54:40,361 INFO L482 AbstractCegarLoop]: Abstraction has 415 states and 1389 transitions. [2021-06-12 18:54:40,361 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,362 INFO L276 IsEmpty]: Start isEmpty. Operand 415 states and 1389 transitions. [2021-06-12 18:54:40,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-06-12 18:54:40,363 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 18:54:40,363 INFO L472 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 18:54:40,363 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-06-12 18:54:40,364 INFO L430 AbstractCegarLoop]: === Iteration 4 === [Process2Err0ASSERT_VIOLATIONASSERT]=== [2021-06-12 18:54:40,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 18:54:40,364 INFO L82 PathProgramCache]: Analyzing trace with hash -654503842, now seen corresponding path program 1 times [2021-06-12 18:54:40,365 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 18:54:40,365 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1619538202] [2021-06-12 18:54:40,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 18:54:40,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 18:54:40,406 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 18:54:40,406 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 18:54:40,407 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1619538202] [2021-06-12 18:54:40,407 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1619538202] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-12 18:54:40,407 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-12 18:54:40,407 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-06-12 18:54:40,407 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171591406] [2021-06-12 18:54:40,408 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-06-12 18:54:40,408 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 18:54:40,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-06-12 18:54:40,409 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 18:54:40,409 INFO L87 Difference]: Start difference. First operand 415 states and 1389 transitions. Second operand has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 18:54:40,443 INFO L93 Difference]: Finished difference Result 487 states and 1625 transitions. [2021-06-12 18:54:40,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-06-12 18:54:40,444 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-06-12 18:54:40,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 18:54:40,447 INFO L225 Difference]: With dead ends: 487 [2021-06-12 18:54:40,447 INFO L226 Difference]: Without dead ends: 487 [2021-06-12 18:54:40,448 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.7ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 18:54:40,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 487 states. [2021-06-12 18:54:40,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 487 to 463. [2021-06-12 18:54:40,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 463 states have (on average 3.32829373650108) internal successors, (1541), 462 states have internal predecessors, (1541), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 1541 transitions. [2021-06-12 18:54:40,468 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 1541 transitions. Word has length 19 [2021-06-12 18:54:40,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 18:54:40,469 INFO L482 AbstractCegarLoop]: Abstraction has 463 states and 1541 transitions. [2021-06-12 18:54:40,469 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,470 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 1541 transitions. [2021-06-12 18:54:40,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-06-12 18:54:40,472 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 18:54:40,472 INFO L472 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 18:54:40,472 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-06-12 18:54:40,472 INFO L430 AbstractCegarLoop]: === Iteration 5 === [Process2Err0ASSERT_VIOLATIONASSERT]=== [2021-06-12 18:54:40,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 18:54:40,473 INFO L82 PathProgramCache]: Analyzing trace with hash -654193678, now seen corresponding path program 2 times [2021-06-12 18:54:40,473 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 18:54:40,474 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1903379583] [2021-06-12 18:54:40,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 18:54:40,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 18:54:40,500 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 18:54:40,500 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 18:54:40,500 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1903379583] [2021-06-12 18:54:40,501 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1903379583] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-12 18:54:40,501 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-12 18:54:40,501 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-06-12 18:54:40,501 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1436686153] [2021-06-12 18:54:40,502 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-06-12 18:54:40,502 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 18:54:40,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-06-12 18:54:40,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 18:54:40,503 INFO L87 Difference]: Start difference. First operand 463 states and 1541 transitions. Second operand has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 18:54:40,534 INFO L93 Difference]: Finished difference Result 499 states and 1644 transitions. [2021-06-12 18:54:40,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-06-12 18:54:40,535 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-06-12 18:54:40,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 18:54:40,537 INFO L225 Difference]: With dead ends: 499 [2021-06-12 18:54:40,537 INFO L226 Difference]: Without dead ends: 403 [2021-06-12 18:54:40,537 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.6ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 18:54:40,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2021-06-12 18:54:40,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 379. [2021-06-12 18:54:40,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 379 states, 379 states have (on average 3.2506596306068603) internal successors, (1232), 378 states have internal predecessors, (1232), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 1232 transitions. [2021-06-12 18:54:40,550 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 1232 transitions. Word has length 19 [2021-06-12 18:54:40,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 18:54:40,551 INFO L482 AbstractCegarLoop]: Abstraction has 379 states and 1232 transitions. [2021-06-12 18:54:40,551 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,551 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 1232 transitions. [2021-06-12 18:54:40,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-06-12 18:54:40,552 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 18:54:40,553 INFO L472 BasicCegarLoop]: 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] [2021-06-12 18:54:40,553 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-06-12 18:54:40,553 INFO L430 AbstractCegarLoop]: === Iteration 6 === [Process2Err0ASSERT_VIOLATIONASSERT]=== [2021-06-12 18:54:40,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 18:54:40,553 INFO L82 PathProgramCache]: Analyzing trace with hash -2077212379, now seen corresponding path program 1 times [2021-06-12 18:54:40,553 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 18:54:40,554 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [528007222] [2021-06-12 18:54:40,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 18:54:40,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 18:54:40,609 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 18:54:40,609 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 18:54:40,609 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [528007222] [2021-06-12 18:54:40,610 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [528007222] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-12 18:54:40,610 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-12 18:54:40,610 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-06-12 18:54:40,611 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1487142861] [2021-06-12 18:54:40,614 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-06-12 18:54:40,615 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 18:54:40,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-06-12 18:54:40,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-06-12 18:54:40,615 INFO L87 Difference]: Start difference. First operand 379 states and 1232 transitions. Second operand has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 18:54:40,653 INFO L93 Difference]: Finished difference Result 398 states and 1271 transitions. [2021-06-12 18:54:40,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-06-12 18:54:40,654 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-06-12 18:54:40,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 18:54:40,656 INFO L225 Difference]: With dead ends: 398 [2021-06-12 18:54:40,656 INFO L226 Difference]: Without dead ends: 398 [2021-06-12 18:54:40,657 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 15.9ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-06-12 18:54:40,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2021-06-12 18:54:40,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 398. [2021-06-12 18:54:40,666 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 398 states, 398 states have (on average 3.193467336683417) internal successors, (1271), 397 states have internal predecessors, (1271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 1271 transitions. [2021-06-12 18:54:40,670 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 1271 transitions. Word has length 26 [2021-06-12 18:54:40,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 18:54:40,671 INFO L482 AbstractCegarLoop]: Abstraction has 398 states and 1271 transitions. [2021-06-12 18:54:40,671 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,671 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 1271 transitions. [2021-06-12 18:54:40,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-06-12 18:54:40,672 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 18:54:40,672 INFO L472 BasicCegarLoop]: 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] [2021-06-12 18:54:40,672 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-06-12 18:54:40,673 INFO L430 AbstractCegarLoop]: === Iteration 7 === [Process2Err0ASSERT_VIOLATIONASSERT]=== [2021-06-12 18:54:40,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 18:54:40,673 INFO L82 PathProgramCache]: Analyzing trace with hash -1176211918, now seen corresponding path program 1 times [2021-06-12 18:54:40,673 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 18:54:40,673 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [859280963] [2021-06-12 18:54:40,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 18:54:40,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 18:54:40,738 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 18:54:40,738 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 18:54:40,739 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [859280963] [2021-06-12 18:54:40,739 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [859280963] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-12 18:54:40,739 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-12 18:54:40,739 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-06-12 18:54:40,739 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1650508006] [2021-06-12 18:54:40,740 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-06-12 18:54:40,740 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 18:54:40,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-06-12 18:54:40,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-06-12 18:54:40,741 INFO L87 Difference]: Start difference. First operand 398 states and 1271 transitions. Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 18:54:40,874 INFO L93 Difference]: Finished difference Result 468 states and 1458 transitions. [2021-06-12 18:54:40,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-06-12 18:54:40,874 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-06-12 18:54:40,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 18:54:40,877 INFO L225 Difference]: With dead ends: 468 [2021-06-12 18:54:40,877 INFO L226 Difference]: Without dead ends: 384 [2021-06-12 18:54:40,878 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 59.3ms TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2021-06-12 18:54:40,879 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 384 states. [2021-06-12 18:54:40,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 384 to 384. [2021-06-12 18:54:40,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 384 states, 384 states have (on average 3.203125) internal successors, (1230), 383 states have internal predecessors, (1230), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 384 states to 384 states and 1230 transitions. [2021-06-12 18:54:40,890 INFO L78 Accepts]: Start accepts. Automaton has 384 states and 1230 transitions. Word has length 27 [2021-06-12 18:54:40,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 18:54:40,891 INFO L482 AbstractCegarLoop]: Abstraction has 384 states and 1230 transitions. [2021-06-12 18:54:40,891 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,891 INFO L276 IsEmpty]: Start isEmpty. Operand 384 states and 1230 transitions. [2021-06-12 18:54:40,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-06-12 18:54:40,892 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 18:54:40,892 INFO L472 BasicCegarLoop]: 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] [2021-06-12 18:54:40,892 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-06-12 18:54:40,892 INFO L430 AbstractCegarLoop]: === Iteration 8 === [Process2Err0ASSERT_VIOLATIONASSERT]=== [2021-06-12 18:54:40,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 18:54:40,892 INFO L82 PathProgramCache]: Analyzing trace with hash 505048550, now seen corresponding path program 2 times [2021-06-12 18:54:40,893 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 18:54:40,893 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [69479594] [2021-06-12 18:54:40,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 18:54:40,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 18:54:40,933 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 18:54:40,933 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 18:54:40,933 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [69479594] [2021-06-12 18:54:40,934 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [69479594] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-12 18:54:40,934 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-12 18:54:40,934 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-06-12 18:54:40,935 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370459151] [2021-06-12 18:54:40,936 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-06-12 18:54:40,936 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 18:54:40,936 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-06-12 18:54:40,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-06-12 18:54:40,937 INFO L87 Difference]: Start difference. First operand 384 states and 1230 transitions. Second operand has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 18:54:40,961 INFO L93 Difference]: Finished difference Result 402 states and 1269 transitions. [2021-06-12 18:54:40,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-06-12 18:54:40,961 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-06-12 18:54:40,961 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 18:54:40,963 INFO L225 Difference]: With dead ends: 402 [2021-06-12 18:54:40,964 INFO L226 Difference]: Without dead ends: 402 [2021-06-12 18:54:40,964 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 12.5ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-06-12 18:54:40,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2021-06-12 18:54:40,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 402. [2021-06-12 18:54:40,973 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 402 states, 402 states have (on average 3.156716417910448) internal successors, (1269), 401 states have internal predecessors, (1269), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 1269 transitions. [2021-06-12 18:54:40,975 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 1269 transitions. Word has length 27 [2021-06-12 18:54:40,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 18:54:40,975 INFO L482 AbstractCegarLoop]: Abstraction has 402 states and 1269 transitions. [2021-06-12 18:54:40,975 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:40,975 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 1269 transitions. [2021-06-12 18:54:40,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-06-12 18:54:40,976 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 18:54:40,976 INFO L472 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 18:54:40,976 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-06-12 18:54:40,977 INFO L430 AbstractCegarLoop]: === Iteration 9 === [Process2Err0ASSERT_VIOLATIONASSERT]=== [2021-06-12 18:54:40,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 18:54:40,977 INFO L82 PathProgramCache]: Analyzing trace with hash 2085590105, now seen corresponding path program 3 times [2021-06-12 18:54:40,977 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 18:54:40,977 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1741375339] [2021-06-12 18:54:40,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 18:54:40,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 18:54:41,011 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 18:54:41,012 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 18:54:41,012 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1741375339] [2021-06-12 18:54:41,012 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1741375339] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-12 18:54:41,012 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-12 18:54:41,012 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-06-12 18:54:41,012 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484879641] [2021-06-12 18:54:41,013 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-06-12 18:54:41,013 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 18:54:41,013 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-06-12 18:54:41,013 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-06-12 18:54:41,013 INFO L87 Difference]: Start difference. First operand 402 states and 1269 transitions. Second operand has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 18:54:41,098 INFO L93 Difference]: Finished difference Result 244 states and 724 transitions. [2021-06-12 18:54:41,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-06-12 18:54:41,098 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-06-12 18:54:41,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 18:54:41,098 INFO L225 Difference]: With dead ends: 244 [2021-06-12 18:54:41,099 INFO L226 Difference]: Without dead ends: 0 [2021-06-12 18:54:41,099 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 48.7ms TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2021-06-12 18:54:41,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-06-12 18:54:41,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-06-12 18:54:41,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-06-12 18:54:41,099 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 28 [2021-06-12 18:54:41,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 18:54:41,100 INFO L482 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-06-12 18:54:41,100 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,100 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-06-12 18:54:41,100 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-06-12 18:54:41,100 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-06-12 18:54:41,100 INFO L301 ceAbstractionStarter]: Result for error location Process2Thread1of1ForFork2 was SAFE (1/5) [2021-06-12 18:54:41,102 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-06-12 18:54:41,103 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-12 18:54:41,103 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-12 18:54:41,103 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-12 18:54:41,103 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-12 18:54:41,103 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-12 18:54:41,103 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-12 18:54:41,103 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-12 18:54:41,103 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == Process2======== [2021-06-12 18:54:41,105 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 51 places, 46 transitions, 107 flow [2021-06-12 18:54:41,142 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 1403 states, 1399 states have (on average 3.6125804145818443) internal successors, (5054), 1402 states have internal predecessors, (5054), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,146 INFO L276 IsEmpty]: Start isEmpty. Operand has 1403 states, 1399 states have (on average 3.6125804145818443) internal successors, (5054), 1402 states have internal predecessors, (5054), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,151 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-06-12 18:54:41,152 INFO L301 ceAbstractionStarter]: Result for error location Process2 was SAFE (2/5) [2021-06-12 18:54:41,173 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-06-12 18:54:41,174 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-12 18:54:41,174 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-12 18:54:41,174 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-12 18:54:41,174 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-12 18:54:41,174 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-12 18:54:41,174 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-12 18:54:41,175 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-12 18:54:41,175 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == Process1======== [2021-06-12 18:54:41,177 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 51 places, 46 transitions, 107 flow [2021-06-12 18:54:41,236 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 1403 states, 1399 states have (on average 3.6125804145818443) internal successors, (5054), 1402 states have internal predecessors, (5054), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,240 INFO L276 IsEmpty]: Start isEmpty. Operand has 1403 states, 1399 states have (on average 3.6125804145818443) internal successors, (5054), 1402 states have internal predecessors, (5054), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,245 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-06-12 18:54:41,245 INFO L301 ceAbstractionStarter]: Result for error location Process1 was SAFE (3/5) [2021-06-12 18:54:41,246 INFO L255 AbstractCegarLoop]: Starting to check reachability of 3 error locations. [2021-06-12 18:54:41,246 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-12 18:54:41,246 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-12 18:54:41,247 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-12 18:54:41,247 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-12 18:54:41,247 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-12 18:54:41,247 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-12 18:54:41,247 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-12 18:54:41,247 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.start======== [2021-06-12 18:54:41,248 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 51 places, 46 transitions, 107 flow [2021-06-12 18:54:41,283 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 1403 states, 1399 states have (on average 3.6125804145818443) internal successors, (5054), 1402 states have internal predecessors, (5054), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,287 INFO L276 IsEmpty]: Start isEmpty. Operand has 1403 states, 1399 states have (on average 3.6125804145818443) internal successors, (5054), 1402 states have internal predecessors, (5054), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,293 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-06-12 18:54:41,293 INFO L301 ceAbstractionStarter]: Result for error location ULTIMATE.start was SAFE (4/5) [2021-06-12 18:54:41,293 INFO L255 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-06-12 18:54:41,294 INFO L378 AbstractCegarLoop]: Interprodecural is true [2021-06-12 18:54:41,294 INFO L379 AbstractCegarLoop]: Hoare is false [2021-06-12 18:54:41,294 INFO L380 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-06-12 18:54:41,294 INFO L381 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-06-12 18:54:41,294 INFO L382 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-06-12 18:54:41,294 INFO L383 AbstractCegarLoop]: Difference is false [2021-06-12 18:54:41,294 INFO L384 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-06-12 18:54:41,294 INFO L388 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == Process1Thread1of1ForFork1======== [2021-06-12 18:54:41,295 INFO L100 iNet2FiniteAutomaton]: Start petriNet2FiniteAutomaton. Operand has 51 places, 46 transitions, 107 flow [2021-06-12 18:54:41,331 INFO L122 iNet2FiniteAutomaton]: Finished petriNet2FiniteAutomaton. Result has 1403 states, 1399 states have (on average 3.6125804145818443) internal successors, (5054), 1402 states have internal predecessors, (5054), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,334 INFO L276 IsEmpty]: Start isEmpty. Operand has 1403 states, 1399 states have (on average 3.6125804145818443) internal successors, (5054), 1402 states have internal predecessors, (5054), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-06-12 18:54:41,335 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 18:54:41,335 INFO L472 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 18:54:41,335 INFO L430 AbstractCegarLoop]: === Iteration 1 === [Process1Err0ASSERT_VIOLATIONASSERT]=== [2021-06-12 18:54:41,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 18:54:41,335 INFO L82 PathProgramCache]: Analyzing trace with hash -559778971, now seen corresponding path program 1 times [2021-06-12 18:54:41,336 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 18:54:41,336 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1449115131] [2021-06-12 18:54:41,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 18:54:41,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 18:54:41,344 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 18:54:41,344 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 18:54:41,344 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1449115131] [2021-06-12 18:54:41,344 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1449115131] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-12 18:54:41,345 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-12 18:54:41,345 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-06-12 18:54:41,345 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046719182] [2021-06-12 18:54:41,345 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-06-12 18:54:41,345 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 18:54:41,345 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-06-12 18:54:41,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 18:54:41,349 INFO L87 Difference]: Start difference. First operand has 1403 states, 1399 states have (on average 3.6125804145818443) internal successors, (5054), 1402 states have internal predecessors, (5054), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 18:54:41,363 INFO L93 Difference]: Finished difference Result 398 states and 1386 transitions. [2021-06-12 18:54:41,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-06-12 18:54:41,364 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-06-12 18:54:41,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 18:54:41,366 INFO L225 Difference]: With dead ends: 398 [2021-06-12 18:54:41,366 INFO L226 Difference]: Without dead ends: 374 [2021-06-12 18:54:41,366 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.1ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 18:54:41,368 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2021-06-12 18:54:41,374 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 350. [2021-06-12 18:54:41,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 350 states, 350 states have (on average 3.5314285714285716) internal successors, (1236), 349 states have internal predecessors, (1236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 350 states to 350 states and 1236 transitions. [2021-06-12 18:54:41,377 INFO L78 Accepts]: Start accepts. Automaton has 350 states and 1236 transitions. Word has length 8 [2021-06-12 18:54:41,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 18:54:41,377 INFO L482 AbstractCegarLoop]: Abstraction has 350 states and 1236 transitions. [2021-06-12 18:54:41,377 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 3 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,377 INFO L276 IsEmpty]: Start isEmpty. Operand 350 states and 1236 transitions. [2021-06-12 18:54:41,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-06-12 18:54:41,378 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 18:54:41,378 INFO L472 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 18:54:41,378 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-06-12 18:54:41,378 INFO L430 AbstractCegarLoop]: === Iteration 2 === [Process1Err0ASSERT_VIOLATIONASSERT]=== [2021-06-12 18:54:41,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 18:54:41,379 INFO L82 PathProgramCache]: Analyzing trace with hash 419256713, now seen corresponding path program 1 times [2021-06-12 18:54:41,379 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 18:54:41,379 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [778210545] [2021-06-12 18:54:41,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 18:54:41,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 18:54:41,388 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 18:54:41,388 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 18:54:41,388 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [778210545] [2021-06-12 18:54:41,388 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [778210545] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-12 18:54:41,388 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-12 18:54:41,388 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-06-12 18:54:41,389 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1622191058] [2021-06-12 18:54:41,389 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-06-12 18:54:41,389 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 18:54:41,389 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-06-12 18:54:41,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 18:54:41,390 INFO L87 Difference]: Start difference. First operand 350 states and 1236 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 18:54:41,410 INFO L93 Difference]: Finished difference Result 569 states and 1978 transitions. [2021-06-12 18:54:41,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-06-12 18:54:41,411 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-06-12 18:54:41,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 18:54:41,413 INFO L225 Difference]: With dead ends: 569 [2021-06-12 18:54:41,414 INFO L226 Difference]: Without dead ends: 473 [2021-06-12 18:54:41,414 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 18:54:41,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 473 states. [2021-06-12 18:54:41,422 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 473 to 359. [2021-06-12 18:54:41,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 359 states, 359 states have (on average 3.367688022284123) internal successors, (1209), 358 states have internal predecessors, (1209), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 359 states to 359 states and 1209 transitions. [2021-06-12 18:54:41,425 INFO L78 Accepts]: Start accepts. Automaton has 359 states and 1209 transitions. Word has length 12 [2021-06-12 18:54:41,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 18:54:41,425 INFO L482 AbstractCegarLoop]: Abstraction has 359 states and 1209 transitions. [2021-06-12 18:54:41,425 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,425 INFO L276 IsEmpty]: Start isEmpty. Operand 359 states and 1209 transitions. [2021-06-12 18:54:41,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-06-12 18:54:41,426 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 18:54:41,426 INFO L472 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 18:54:41,426 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-06-12 18:54:41,426 INFO L430 AbstractCegarLoop]: === Iteration 3 === [Process1Err0ASSERT_VIOLATIONASSERT]=== [2021-06-12 18:54:41,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 18:54:41,427 INFO L82 PathProgramCache]: Analyzing trace with hash 1014480893, now seen corresponding path program 2 times [2021-06-12 18:54:41,427 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 18:54:41,427 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [538537546] [2021-06-12 18:54:41,427 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 18:54:41,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 18:54:41,435 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 18:54:41,436 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 18:54:41,436 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [538537546] [2021-06-12 18:54:41,436 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [538537546] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-12 18:54:41,436 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-12 18:54:41,436 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-06-12 18:54:41,436 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381840613] [2021-06-12 18:54:41,437 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-06-12 18:54:41,437 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 18:54:41,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-06-12 18:54:41,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 18:54:41,437 INFO L87 Difference]: Start difference. First operand 359 states and 1209 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 18:54:41,458 INFO L93 Difference]: Finished difference Result 461 states and 1548 transitions. [2021-06-12 18:54:41,459 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-06-12 18:54:41,459 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-06-12 18:54:41,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 18:54:41,462 INFO L225 Difference]: With dead ends: 461 [2021-06-12 18:54:41,462 INFO L226 Difference]: Without dead ends: 461 [2021-06-12 18:54:41,463 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 18:54:41,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 461 states. [2021-06-12 18:54:41,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 461 to 415. [2021-06-12 18:54:41,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 415 states, 415 states have (on average 3.346987951807229) internal successors, (1389), 414 states have internal predecessors, (1389), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 415 states to 415 states and 1389 transitions. [2021-06-12 18:54:41,475 INFO L78 Accepts]: Start accepts. Automaton has 415 states and 1389 transitions. Word has length 12 [2021-06-12 18:54:41,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 18:54:41,475 INFO L482 AbstractCegarLoop]: Abstraction has 415 states and 1389 transitions. [2021-06-12 18:54:41,475 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,475 INFO L276 IsEmpty]: Start isEmpty. Operand 415 states and 1389 transitions. [2021-06-12 18:54:41,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-06-12 18:54:41,476 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 18:54:41,476 INFO L472 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 18:54:41,476 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-06-12 18:54:41,476 INFO L430 AbstractCegarLoop]: === Iteration 4 === [Process1Err0ASSERT_VIOLATIONASSERT]=== [2021-06-12 18:54:41,477 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 18:54:41,477 INFO L82 PathProgramCache]: Analyzing trace with hash -1957429318, now seen corresponding path program 1 times [2021-06-12 18:54:41,477 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 18:54:41,477 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1586840013] [2021-06-12 18:54:41,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 18:54:41,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 18:54:41,494 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 18:54:41,494 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 18:54:41,494 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1586840013] [2021-06-12 18:54:41,494 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1586840013] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-12 18:54:41,494 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-12 18:54:41,494 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-06-12 18:54:41,494 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [876672016] [2021-06-12 18:54:41,495 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-06-12 18:54:41,495 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 18:54:41,495 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-06-12 18:54:41,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 18:54:41,496 INFO L87 Difference]: Start difference. First operand 415 states and 1389 transitions. Second operand has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 18:54:41,511 INFO L93 Difference]: Finished difference Result 487 states and 1625 transitions. [2021-06-12 18:54:41,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-06-12 18:54:41,511 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-06-12 18:54:41,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 18:54:41,514 INFO L225 Difference]: With dead ends: 487 [2021-06-12 18:54:41,514 INFO L226 Difference]: Without dead ends: 487 [2021-06-12 18:54:41,514 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 18:54:41,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 487 states. [2021-06-12 18:54:41,530 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 487 to 463. [2021-06-12 18:54:41,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 463 states, 463 states have (on average 3.32829373650108) internal successors, (1541), 462 states have internal predecessors, (1541), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 463 states to 463 states and 1541 transitions. [2021-06-12 18:54:41,533 INFO L78 Accepts]: Start accepts. Automaton has 463 states and 1541 transitions. Word has length 19 [2021-06-12 18:54:41,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 18:54:41,533 INFO L482 AbstractCegarLoop]: Abstraction has 463 states and 1541 transitions. [2021-06-12 18:54:41,533 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,533 INFO L276 IsEmpty]: Start isEmpty. Operand 463 states and 1541 transitions. [2021-06-12 18:54:41,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-06-12 18:54:41,534 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 18:54:41,534 INFO L472 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 18:54:41,534 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-06-12 18:54:41,534 INFO L430 AbstractCegarLoop]: === Iteration 5 === [Process1Err0ASSERT_VIOLATIONASSERT]=== [2021-06-12 18:54:41,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 18:54:41,535 INFO L82 PathProgramCache]: Analyzing trace with hash -654209534, now seen corresponding path program 2 times [2021-06-12 18:54:41,535 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 18:54:41,535 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1341363995] [2021-06-12 18:54:41,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 18:54:41,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 18:54:41,557 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 18:54:41,557 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 18:54:41,557 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1341363995] [2021-06-12 18:54:41,557 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1341363995] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-12 18:54:41,557 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-12 18:54:41,557 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-06-12 18:54:41,558 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1993564781] [2021-06-12 18:54:41,558 INFO L462 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-06-12 18:54:41,558 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 18:54:41,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-06-12 18:54:41,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 18:54:41,559 INFO L87 Difference]: Start difference. First operand 463 states and 1541 transitions. Second operand has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 18:54:41,575 INFO L93 Difference]: Finished difference Result 499 states and 1644 transitions. [2021-06-12 18:54:41,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-06-12 18:54:41,576 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-06-12 18:54:41,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 18:54:41,578 INFO L225 Difference]: With dead ends: 499 [2021-06-12 18:54:41,578 INFO L226 Difference]: Without dead ends: 403 [2021-06-12 18:54:41,578 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-06-12 18:54:41,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2021-06-12 18:54:41,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 379. [2021-06-12 18:54:41,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 379 states, 379 states have (on average 3.2506596306068603) internal successors, (1232), 378 states have internal predecessors, (1232), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 1232 transitions. [2021-06-12 18:54:41,589 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 1232 transitions. Word has length 19 [2021-06-12 18:54:41,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 18:54:41,589 INFO L482 AbstractCegarLoop]: Abstraction has 379 states and 1232 transitions. [2021-06-12 18:54:41,589 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 6.333333333333333) internal successors, (19), 3 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,589 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 1232 transitions. [2021-06-12 18:54:41,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-06-12 18:54:41,590 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 18:54:41,590 INFO L472 BasicCegarLoop]: 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] [2021-06-12 18:54:41,590 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-06-12 18:54:41,590 INFO L430 AbstractCegarLoop]: === Iteration 6 === [Process1Err0ASSERT_VIOLATIONASSERT]=== [2021-06-12 18:54:41,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 18:54:41,591 INFO L82 PathProgramCache]: Analyzing trace with hash -2077228235, now seen corresponding path program 1 times [2021-06-12 18:54:41,591 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 18:54:41,591 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [397597094] [2021-06-12 18:54:41,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 18:54:41,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 18:54:41,613 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 18:54:41,613 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 18:54:41,613 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [397597094] [2021-06-12 18:54:41,614 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [397597094] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-12 18:54:41,614 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-12 18:54:41,614 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-06-12 18:54:41,614 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1741553677] [2021-06-12 18:54:41,614 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-06-12 18:54:41,614 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 18:54:41,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-06-12 18:54:41,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-06-12 18:54:41,615 INFO L87 Difference]: Start difference. First operand 379 states and 1232 transitions. Second operand has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 18:54:41,636 INFO L93 Difference]: Finished difference Result 398 states and 1273 transitions. [2021-06-12 18:54:41,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-06-12 18:54:41,637 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-06-12 18:54:41,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 18:54:41,639 INFO L225 Difference]: With dead ends: 398 [2021-06-12 18:54:41,639 INFO L226 Difference]: Without dead ends: 398 [2021-06-12 18:54:41,640 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.6ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-06-12 18:54:41,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 398 states. [2021-06-12 18:54:41,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 398 to 398. [2021-06-12 18:54:41,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 398 states, 398 states have (on average 3.198492462311558) internal successors, (1273), 397 states have internal predecessors, (1273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 1273 transitions. [2021-06-12 18:54:41,650 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 1273 transitions. Word has length 26 [2021-06-12 18:54:41,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 18:54:41,650 INFO L482 AbstractCegarLoop]: Abstraction has 398 states and 1273 transitions. [2021-06-12 18:54:41,651 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,651 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 1273 transitions. [2021-06-12 18:54:41,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-06-12 18:54:41,651 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 18:54:41,652 INFO L472 BasicCegarLoop]: 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] [2021-06-12 18:54:41,652 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-06-12 18:54:41,652 INFO L430 AbstractCegarLoop]: === Iteration 7 === [Process1Err0ASSERT_VIOLATIONASSERT]=== [2021-06-12 18:54:41,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 18:54:41,652 INFO L82 PathProgramCache]: Analyzing trace with hash -1176227774, now seen corresponding path program 1 times [2021-06-12 18:54:41,652 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 18:54:41,652 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1865913828] [2021-06-12 18:54:41,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 18:54:41,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 18:54:41,711 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 18:54:41,711 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 18:54:41,711 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1865913828] [2021-06-12 18:54:41,711 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1865913828] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-12 18:54:41,711 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-12 18:54:41,712 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-06-12 18:54:41,712 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1413121669] [2021-06-12 18:54:41,712 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-06-12 18:54:41,712 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 18:54:41,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-06-12 18:54:41,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-06-12 18:54:41,713 INFO L87 Difference]: Start difference. First operand 398 states and 1273 transitions. Second operand has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,790 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 18:54:41,790 INFO L93 Difference]: Finished difference Result 468 states and 1460 transitions. [2021-06-12 18:54:41,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-06-12 18:54:41,791 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-06-12 18:54:41,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 18:54:41,793 INFO L225 Difference]: With dead ends: 468 [2021-06-12 18:54:41,793 INFO L226 Difference]: Without dead ends: 384 [2021-06-12 18:54:41,793 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 43.9ms TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2021-06-12 18:54:41,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 384 states. [2021-06-12 18:54:41,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 384 to 384. [2021-06-12 18:54:41,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 384 states, 384 states have (on average 3.2083333333333335) internal successors, (1232), 383 states have internal predecessors, (1232), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 384 states to 384 states and 1232 transitions. [2021-06-12 18:54:41,802 INFO L78 Accepts]: Start accepts. Automaton has 384 states and 1232 transitions. Word has length 27 [2021-06-12 18:54:41,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 18:54:41,803 INFO L482 AbstractCegarLoop]: Abstraction has 384 states and 1232 transitions. [2021-06-12 18:54:41,803 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.5) internal successors, (27), 6 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,803 INFO L276 IsEmpty]: Start isEmpty. Operand 384 states and 1232 transitions. [2021-06-12 18:54:41,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-06-12 18:54:41,804 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 18:54:41,804 INFO L472 BasicCegarLoop]: 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] [2021-06-12 18:54:41,804 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-06-12 18:54:41,804 INFO L430 AbstractCegarLoop]: === Iteration 8 === [Process1Err0ASSERT_VIOLATIONASSERT]=== [2021-06-12 18:54:41,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 18:54:41,804 INFO L82 PathProgramCache]: Analyzing trace with hash 505032694, now seen corresponding path program 2 times [2021-06-12 18:54:41,804 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 18:54:41,805 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [394154140] [2021-06-12 18:54:41,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 18:54:41,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 18:54:41,820 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 18:54:41,821 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 18:54:41,821 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [394154140] [2021-06-12 18:54:41,821 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [394154140] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-12 18:54:41,821 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-12 18:54:41,821 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-06-12 18:54:41,821 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435522966] [2021-06-12 18:54:41,821 INFO L462 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-06-12 18:54:41,821 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 18:54:41,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-06-12 18:54:41,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-06-12 18:54:41,822 INFO L87 Difference]: Start difference. First operand 384 states and 1232 transitions. Second operand has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 18:54:41,845 INFO L93 Difference]: Finished difference Result 402 states and 1269 transitions. [2021-06-12 18:54:41,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-06-12 18:54:41,846 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-06-12 18:54:41,846 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 18:54:41,848 INFO L225 Difference]: With dead ends: 402 [2021-06-12 18:54:41,849 INFO L226 Difference]: Without dead ends: 402 [2021-06-12 18:54:41,849 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 9.4ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-06-12 18:54:41,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2021-06-12 18:54:41,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 402. [2021-06-12 18:54:41,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 402 states, 402 states have (on average 3.156716417910448) internal successors, (1269), 401 states have internal predecessors, (1269), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 1269 transitions. [2021-06-12 18:54:41,865 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 1269 transitions. Word has length 27 [2021-06-12 18:54:41,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 18:54:41,866 INFO L482 AbstractCegarLoop]: Abstraction has 402 states and 1269 transitions. [2021-06-12 18:54:41,866 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 6.75) internal successors, (27), 4 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,866 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 1269 transitions. [2021-06-12 18:54:41,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-06-12 18:54:41,867 INFO L464 BasicCegarLoop]: Found error trace [2021-06-12 18:54:41,867 INFO L472 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-06-12 18:54:41,867 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-06-12 18:54:41,867 INFO L430 AbstractCegarLoop]: === Iteration 9 === [Process1Err0ASSERT_VIOLATIONASSERT]=== [2021-06-12 18:54:41,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-06-12 18:54:41,868 INFO L82 PathProgramCache]: Analyzing trace with hash 2085574249, now seen corresponding path program 3 times [2021-06-12 18:54:41,868 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-06-12 18:54:41,868 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [860694746] [2021-06-12 18:54:41,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-06-12 18:54:41,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-06-12 18:54:41,903 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-06-12 18:54:41,904 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-06-12 18:54:41,904 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [860694746] [2021-06-12 18:54:41,904 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [860694746] provided 1 perfect and 0 imperfect interpolant sequences [2021-06-12 18:54:41,904 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-06-12 18:54:41,904 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-06-12 18:54:41,904 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1105929250] [2021-06-12 18:54:41,904 INFO L462 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-06-12 18:54:41,904 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-06-12 18:54:41,905 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-06-12 18:54:41,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-06-12 18:54:41,905 INFO L87 Difference]: Start difference. First operand 402 states and 1269 transitions. Second operand has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-06-12 18:54:41,993 INFO L93 Difference]: Finished difference Result 244 states and 724 transitions. [2021-06-12 18:54:41,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-06-12 18:54:41,993 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-06-12 18:54:41,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-06-12 18:54:41,994 INFO L225 Difference]: With dead ends: 244 [2021-06-12 18:54:41,994 INFO L226 Difference]: Without dead ends: 0 [2021-06-12 18:54:41,994 INFO L728 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 47.6ms TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2021-06-12 18:54:41,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-06-12 18:54:41,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-06-12 18:54:41,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,995 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-06-12 18:54:41,995 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 28 [2021-06-12 18:54:41,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-06-12 18:54:41,995 INFO L482 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-06-12 18:54:41,995 INFO L483 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-06-12 18:54:41,995 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-06-12 18:54:41,995 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-06-12 18:54:41,995 WARN L519 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-06-12 18:54:41,996 INFO L301 ceAbstractionStarter]: Result for error location Process1Thread1of1ForFork1 was SAFE (5/5) [2021-06-12 18:54:41,996 INFO L247 ceAbstractionStarter]: Analysis of concurrent program completed with 1 thread instances [2021-06-12 18:54:41,999 INFO L202 PluginConnector]: Adding new model Fischer.bpl de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 12.06 06:54:41 BasicIcfg [2021-06-12 18:54:41,999 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-06-12 18:54:42,000 INFO L168 Benchmark]: Toolchain (without parser) took 2902.43 ms. Allocated memory was 197.1 MB in the beginning and 248.5 MB in the end (delta: 51.4 MB). Free memory was 177.4 MB in the beginning and 163.0 MB in the end (delta: 14.4 MB). Peak memory consumption was 67.3 MB. Max. memory is 8.0 GB. [2021-06-12 18:54:42,000 INFO L168 Benchmark]: Boogie PL CUP Parser took 0.16 ms. Allocated memory is still 197.1 MB. Free memory was 178.5 MB in the beginning and 178.4 MB in the end (delta: 89.2 kB). There was no memory consumed. Max. memory is 8.0 GB. [2021-06-12 18:54:42,001 INFO L168 Benchmark]: Boogie Procedure Inliner took 29.55 ms. Allocated memory is still 197.1 MB. Free memory was 177.2 MB in the beginning and 175.9 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-06-12 18:54:42,001 INFO L168 Benchmark]: Boogie Preprocessor took 20.29 ms. Allocated memory is still 197.1 MB. Free memory was 175.9 MB in the beginning and 174.9 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-06-12 18:54:42,001 INFO L168 Benchmark]: RCFGBuilder took 288.29 ms. Allocated memory is still 197.1 MB. Free memory was 174.7 MB in the beginning and 162.3 MB in the end (delta: 12.5 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2021-06-12 18:54:42,003 INFO L168 Benchmark]: TraceAbstraction took 2559.02 ms. Allocated memory was 197.1 MB in the beginning and 248.5 MB in the end (delta: 51.4 MB). Free memory was 161.8 MB in the beginning and 163.0 MB in the end (delta: -1.2 MB). Peak memory consumption was 51.6 MB. Max. memory is 8.0 GB. [2021-06-12 18:54:42,004 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * Boogie PL CUP Parser took 0.16 ms. Allocated memory is still 197.1 MB. Free memory was 178.5 MB in the beginning and 178.4 MB in the end (delta: 89.2 kB). There was no memory consumed. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 29.55 ms. Allocated memory is still 197.1 MB. Free memory was 177.2 MB in the beginning and 175.9 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 20.29 ms. Allocated memory is still 197.1 MB. Free memory was 175.9 MB in the beginning and 174.9 MB in the end (delta: 1.0 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 288.29 ms. Allocated memory is still 197.1 MB. Free memory was 174.7 MB in the beginning and 162.3 MB in the end (delta: 12.5 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2559.02 ms. Allocated memory was 197.1 MB in the beginning and 248.5 MB in the end (delta: 51.4 MB). Free memory was 161.8 MB in the beginning and 163.0 MB in the end (delta: -1.2 MB). Peak memory consumption was 51.6 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 78]: assertion always holds For all program executions holds that assertion always holds at this location - PositiveResult [Line: 57]: assertion always holds For all program executions holds that assertion always holds at this location - StatisticsResult: Ultimate Automizer benchmark data for errors in thread instance: Process2Thread1of1ForFork2 with 1 thread instances CFG has 7 procedures, 78 locations, 7 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 1587.1ms, OverallIterations: 9, TraceHistogramMax: 2, EmptinessCheckTime: 33.5ms, AutomataDifference: 600.9ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 203.4ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 405 SDtfs, 271 SDslu, 361 SDs, 0 SdLazy, 210 SolverSat, 39 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 248.1ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 43 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 160.3ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=1403occurred in iteration=0, InterpolantAutomatonStates: 37, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 199.1ms AutomataMinimizationTime, 9 MinimizatonAttempts, 232 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 21.1ms SsaConstructionTime, 87.3ms SatisfiabilityAnalysisTime, 280.1ms InterpolantComputationTime, 179 NumberOfCodeBlocks, 179 NumberOfCodeBlocksAsserted, 9 NumberOfCheckSat, 170 ConstructedInterpolants, 0 QuantifiedInterpolants, 426 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 9 InterpolantComputations, 9 PerfectInterpolantSequences, 1/1 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - StatisticsResult: Ultimate Automizer benchmark data for errors in thread instance: Process2 with 1 thread instances CFG has 7 procedures, 78 locations, 7 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 48.8ms, OverallIterations: 0, TraceHistogramMax: 0, EmptinessCheckTime: 9.4ms, AutomataDifference: 0.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 38.7ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=1403occurred in iteration=0, InterpolantAutomatonStates: 0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: No data available, ReuseStatistics: No data available - StatisticsResult: Ultimate Automizer benchmark data for errors in thread instance: Process1 with 1 thread instances CFG has 7 procedures, 78 locations, 7 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 71.2ms, OverallIterations: 0, TraceHistogramMax: 0, EmptinessCheckTime: 9.1ms, AutomataDifference: 0.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 61.2ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=1403occurred in iteration=0, InterpolantAutomatonStates: 0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: No data available, ReuseStatistics: No data available - StatisticsResult: Ultimate Automizer benchmark data for errors in thread instance: ULTIMATE.start with 1 thread instances CFG has 7 procedures, 78 locations, 7 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 46.5ms, OverallIterations: 0, TraceHistogramMax: 0, EmptinessCheckTime: 9.0ms, AutomataDifference: 0.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 36.7ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=1403occurred in iteration=0, InterpolantAutomatonStates: 0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: No data available, ReuseStatistics: No data available - StatisticsResult: Ultimate Automizer benchmark data for errors in thread instance: Process1Thread1of1ForFork1 with 1 thread instances CFG has 7 procedures, 78 locations, 7 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 701.6ms, OverallIterations: 9, TraceHistogramMax: 2, EmptinessCheckTime: 9.5ms, AutomataDifference: 335.0ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 36.9ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 405 SDtfs, 274 SDslu, 361 SDs, 0 SdLazy, 210 SolverSat, 39 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 131.9ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 43 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 120.8ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=1403occurred in iteration=0, InterpolantAutomatonStates: 37, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 98.2ms AutomataMinimizationTime, 9 MinimizatonAttempts, 232 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 5.1ms SsaConstructionTime, 18.2ms SatisfiabilityAnalysisTime, 159.1ms InterpolantComputationTime, 178 NumberOfCodeBlocks, 178 NumberOfCodeBlocksAsserted, 9 NumberOfCheckSat, 169 ConstructedInterpolants, 0 QuantifiedInterpolants, 419 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 9 InterpolantComputations, 9 PerfectInterpolantSequences, 1/1 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 2 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! Received shutdown request...