/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/sumt3.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-3af5e1f [2020-09-04 23:24:02,428 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 23:24:02,431 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 23:24:02,458 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 23:24:02,458 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 23:24:02,459 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 23:24:02,461 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 23:24:02,463 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 23:24:02,465 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 23:24:02,466 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 23:24:02,467 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 23:24:02,468 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 23:24:02,468 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 23:24:02,469 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 23:24:02,471 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 23:24:02,472 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 23:24:02,473 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 23:24:02,474 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 23:24:02,476 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 23:24:02,478 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 23:24:02,480 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 23:24:02,481 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 23:24:02,482 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 23:24:02,483 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 23:24:02,486 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 23:24:02,490 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-09-04 23:24:02,491 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-09-04 23:24:02,492 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-09-04 23:24:02,493 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-09-04 23:24:02,494 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-09-04 23:24:02,495 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-09-04 23:24:02,496 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-09-04 23:24:02,496 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-09-04 23:24:02,496 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 23:24:02,497 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 23:24:02,498 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 23:24:02,499 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-09-04 23:24:02,511 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 23:24:02,511 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 23:24:02,513 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 23:24:02,513 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 23:24:02,513 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 23:24:02,513 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 23:24:02,513 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 23:24:02,514 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 23:24:02,514 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 23:24:02,514 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 23:24:02,514 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 23:24:02,514 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 23:24:02,515 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 23:24:02,515 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 23:24:02,515 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 23:24:02,515 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-09-04 23:24:02,516 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 23:24:02,516 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 23:24:02,516 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 23:24:02,516 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 23:24:02,516 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-09-04 23:24:02,517 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 23:24:02,517 INFO L138 SettingsManager]: * Use separate solver for trace checks=false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-09-04 23:24:02,967 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 23:24:02,991 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 23:24:02,997 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 23:24:02,999 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 23:24:03,000 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 23:24:03,001 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/sumt3.c [2020-09-04 23:24:03,093 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/09c7629d3/60ed19a272ea4d2c9b2218961c05d31c/FLAG910a27836 [2020-09-04 23:24:03,624 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 23:24:03,625 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops-crafted-1/sumt3.c [2020-09-04 23:24:03,634 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/09c7629d3/60ed19a272ea4d2c9b2218961c05d31c/FLAG910a27836 [2020-09-04 23:24:03,964 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/09c7629d3/60ed19a272ea4d2c9b2218961c05d31c [2020-09-04 23:24:03,977 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 23:24:03,981 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 23:24:03,985 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 23:24:03,985 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 23:24:03,990 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 23:24:03,991 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 11:24:03" (1/1) ... [2020-09-04 23:24:03,995 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@718a405b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:03, skipping insertion in model container [2020-09-04 23:24:03,996 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 11:24:03" (1/1) ... [2020-09-04 23:24:04,006 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 23:24:04,031 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 23:24:04,252 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 23:24:04,257 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 23:24:04,279 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 23:24:04,295 INFO L208 MainTranslator]: Completed translation [2020-09-04 23:24:04,296 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:04 WrapperNode [2020-09-04 23:24:04,296 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 23:24:04,297 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 23:24:04,297 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 23:24:04,297 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 23:24:04,310 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:04" (1/1) ... [2020-09-04 23:24:04,310 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:04" (1/1) ... [2020-09-04 23:24:04,315 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:04" (1/1) ... [2020-09-04 23:24:04,315 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:04" (1/1) ... [2020-09-04 23:24:04,319 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:04" (1/1) ... [2020-09-04 23:24:04,415 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:04" (1/1) ... [2020-09-04 23:24:04,416 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:04" (1/1) ... [2020-09-04 23:24:04,418 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 23:24:04,419 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 23:24:04,419 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 23:24:04,419 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 23:24:04,420 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:04" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 23:24:04,503 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 23:24:04,503 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 23:24:04,503 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-09-04 23:24:04,504 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-09-04 23:24:04,504 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 23:24:04,504 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 23:24:04,504 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-09-04 23:24:04,504 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-09-04 23:24:04,504 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-09-04 23:24:04,505 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-04 23:24:04,505 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 23:24:04,505 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 23:24:04,505 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 23:24:04,795 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 23:24:04,796 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-09-04 23:24:04,803 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 11:24:04 BoogieIcfgContainer [2020-09-04 23:24:04,803 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 23:24:04,811 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 23:24:04,811 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 23:24:04,817 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 23:24:04,818 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 11:24:03" (1/3) ... [2020-09-04 23:24:04,819 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3373a7e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 11:24:04, skipping insertion in model container [2020-09-04 23:24:04,820 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 11:24:04" (2/3) ... [2020-09-04 23:24:04,820 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3373a7e2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 11:24:04, skipping insertion in model container [2020-09-04 23:24:04,829 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 11:24:04" (3/3) ... [2020-09-04 23:24:04,831 INFO L109 eAbstractionObserver]: Analyzing ICFG sumt3.c [2020-09-04 23:24:04,842 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-09-04 23:24:04,852 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 23:24:04,874 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 23:24:04,899 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 23:24:04,900 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 23:24:04,900 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-09-04 23:24:04,900 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 23:24:04,900 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 23:24:04,900 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 23:24:04,900 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 23:24:04,901 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 23:24:04,916 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states. [2020-09-04 23:24:04,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-09-04 23:24:04,928 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:24:04,929 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:24:04,929 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:24:04,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:24:04,935 INFO L82 PathProgramCache]: Analyzing trace with hash 1514708489, now seen corresponding path program 1 times [2020-09-04 23:24:04,944 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:24:04,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [949428475] [2020-09-04 23:24:04,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:24:05,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:05,573 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 29 [2020-09-04 23:24:05,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:24:05,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:05,736 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:24:05,737 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [949428475] [2020-09-04 23:24:05,739 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 23:24:05,740 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2020-09-04 23:24:05,741 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147735657] [2020-09-04 23:24:05,747 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-09-04 23:24:05,747 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:24:05,764 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-09-04 23:24:05,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-09-04 23:24:05,768 INFO L87 Difference]: Start difference. First operand 38 states. Second operand 10 states. [2020-09-04 23:24:06,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:24:06,298 INFO L93 Difference]: Finished difference Result 68 states and 83 transitions. [2020-09-04 23:24:06,299 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-09-04 23:24:06,300 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 23 [2020-09-04 23:24:06,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:24:06,313 INFO L225 Difference]: With dead ends: 68 [2020-09-04 23:24:06,313 INFO L226 Difference]: Without dead ends: 33 [2020-09-04 23:24:06,319 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2020-09-04 23:24:06,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-09-04 23:24:06,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2020-09-04 23:24:06,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-09-04 23:24:06,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-09-04 23:24:06,372 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 23 [2020-09-04 23:24:06,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:24:06,373 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-09-04 23:24:06,373 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-09-04 23:24:06,373 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-09-04 23:24:06,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-09-04 23:24:06,375 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:24:06,375 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:24:06,375 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 23:24:06,376 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:24:06,376 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:24:06,376 INFO L82 PathProgramCache]: Analyzing trace with hash 993233083, now seen corresponding path program 1 times [2020-09-04 23:24:06,377 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:24:06,377 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [627443735] [2020-09-04 23:24:06,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:24:06,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:06,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:24:06,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:06,985 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:24:06,985 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [627443735] [2020-09-04 23:24:06,985 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:24:06,986 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-09-04 23:24:06,986 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1298844747] [2020-09-04 23:24:06,988 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-09-04 23:24:06,988 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:24:06,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-09-04 23:24:06,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=176, Unknown=0, NotChecked=0, Total=210 [2020-09-04 23:24:06,989 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 15 states. [2020-09-04 23:24:07,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:24:07,674 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2020-09-04 23:24:07,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-04 23:24:07,674 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 27 [2020-09-04 23:24:07,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:24:07,676 INFO L225 Difference]: With dead ends: 45 [2020-09-04 23:24:07,676 INFO L226 Difference]: Without dead ends: 40 [2020-09-04 23:24:07,678 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=131, Invalid=469, Unknown=0, NotChecked=0, Total=600 [2020-09-04 23:24:07,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-09-04 23:24:07,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 35. [2020-09-04 23:24:07,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-09-04 23:24:07,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2020-09-04 23:24:07,690 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 27 [2020-09-04 23:24:07,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:24:07,691 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2020-09-04 23:24:07,691 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-09-04 23:24:07,691 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2020-09-04 23:24:07,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-09-04 23:24:07,692 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:24:07,693 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:24:07,693 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-09-04 23:24:07,693 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:24:07,693 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:24:07,694 INFO L82 PathProgramCache]: Analyzing trace with hash -2107258259, now seen corresponding path program 2 times [2020-09-04 23:24:07,694 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:24:07,694 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1269965418] [2020-09-04 23:24:07,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:24:07,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:07,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:24:07,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:08,000 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:24:08,000 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1269965418] [2020-09-04 23:24:08,001 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:24:08,001 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-09-04 23:24:08,001 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892651141] [2020-09-04 23:24:08,003 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-04 23:24:08,004 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:24:08,004 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-04 23:24:08,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2020-09-04 23:24:08,005 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 9 states. [2020-09-04 23:24:10,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:24:10,388 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2020-09-04 23:24:10,389 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-09-04 23:24:10,389 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-09-04 23:24:10,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:24:10,390 INFO L225 Difference]: With dead ends: 49 [2020-09-04 23:24:10,390 INFO L226 Difference]: Without dead ends: 37 [2020-09-04 23:24:10,391 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-09-04 23:24:10,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-09-04 23:24:10,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2020-09-04 23:24:10,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-09-04 23:24:10,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-09-04 23:24:10,403 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 31 [2020-09-04 23:24:10,404 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:24:10,404 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-09-04 23:24:10,404 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-04 23:24:10,404 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-09-04 23:24:10,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-09-04 23:24:10,405 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:24:10,405 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:24:10,406 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-09-04 23:24:10,406 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:24:10,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:24:10,406 INFO L82 PathProgramCache]: Analyzing trace with hash -1595204474, now seen corresponding path program 1 times [2020-09-04 23:24:10,407 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:24:10,407 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1169456340] [2020-09-04 23:24:10,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:24:10,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:10,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:24:10,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:10,471 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:24:10,471 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1169456340] [2020-09-04 23:24:10,472 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:24:10,472 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-09-04 23:24:10,472 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071825555] [2020-09-04 23:24:10,473 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 23:24:10,473 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:24:10,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 23:24:10,473 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-04 23:24:10,474 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 5 states. [2020-09-04 23:24:10,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:24:10,585 INFO L93 Difference]: Finished difference Result 51 states and 56 transitions. [2020-09-04 23:24:10,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-04 23:24:10,585 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 32 [2020-09-04 23:24:10,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:24:10,587 INFO L225 Difference]: With dead ends: 51 [2020-09-04 23:24:10,587 INFO L226 Difference]: Without dead ends: 39 [2020-09-04 23:24:10,588 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-09-04 23:24:10,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-09-04 23:24:10,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2020-09-04 23:24:10,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-09-04 23:24:10,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2020-09-04 23:24:10,601 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 32 [2020-09-04 23:24:10,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:24:10,602 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2020-09-04 23:24:10,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 23:24:10,602 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2020-09-04 23:24:10,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-09-04 23:24:10,603 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:24:10,603 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:24:10,603 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-09-04 23:24:10,604 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:24:10,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:24:10,604 INFO L82 PathProgramCache]: Analyzing trace with hash 2000770278, now seen corresponding path program 1 times [2020-09-04 23:24:10,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:24:10,605 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [750310790] [2020-09-04 23:24:10,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:24:10,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:11,404 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:24:11,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:11,448 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:24:11,449 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [750310790] [2020-09-04 23:24:11,449 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:24:11,449 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-09-04 23:24:11,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198647635] [2020-09-04 23:24:11,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-09-04 23:24:11,450 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:24:11,450 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-09-04 23:24:11,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=231, Unknown=0, NotChecked=0, Total=272 [2020-09-04 23:24:11,451 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand 17 states. [2020-09-04 23:24:14,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:24:14,485 INFO L93 Difference]: Finished difference Result 50 states and 54 transitions. [2020-09-04 23:24:14,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-09-04 23:24:14,485 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 32 [2020-09-04 23:24:14,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:24:14,486 INFO L225 Difference]: With dead ends: 50 [2020-09-04 23:24:14,487 INFO L226 Difference]: Without dead ends: 45 [2020-09-04 23:24:14,487 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 107 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=149, Invalid=663, Unknown=0, NotChecked=0, Total=812 [2020-09-04 23:24:14,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-09-04 23:24:14,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 40. [2020-09-04 23:24:14,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-09-04 23:24:14,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-09-04 23:24:14,509 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 32 [2020-09-04 23:24:14,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:24:14,512 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-09-04 23:24:14,512 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-09-04 23:24:14,512 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-09-04 23:24:14,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-09-04 23:24:14,513 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:24:14,513 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:24:14,514 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-09-04 23:24:14,514 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:24:14,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:24:14,514 INFO L82 PathProgramCache]: Analyzing trace with hash 755730712, now seen corresponding path program 2 times [2020-09-04 23:24:14,515 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:24:14,515 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1280167948] [2020-09-04 23:24:14,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:24:14,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:18,991 WARN L193 SmtUtils]: Spent 4.20 s on a formula simplification. DAG size of input: 45 DAG size of output: 35 [2020-09-04 23:24:19,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:24:19,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:19,066 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:24:19,066 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1280167948] [2020-09-04 23:24:19,066 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:24:19,067 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-04 23:24:19,067 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2067722665] [2020-09-04 23:24:19,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-04 23:24:19,068 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:24:19,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-04 23:24:19,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-09-04 23:24:19,068 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 9 states. [2020-09-04 23:24:23,736 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:24:23,737 INFO L93 Difference]: Finished difference Result 57 states and 63 transitions. [2020-09-04 23:24:23,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-04 23:24:23,738 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 36 [2020-09-04 23:24:23,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:24:23,739 INFO L225 Difference]: With dead ends: 57 [2020-09-04 23:24:23,739 INFO L226 Difference]: Without dead ends: 45 [2020-09-04 23:24:23,740 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=51, Invalid=131, Unknown=0, NotChecked=0, Total=182 [2020-09-04 23:24:23,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-09-04 23:24:23,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 41. [2020-09-04 23:24:23,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-09-04 23:24:23,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2020-09-04 23:24:23,765 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 36 [2020-09-04 23:24:23,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:24:23,766 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2020-09-04 23:24:23,766 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-04 23:24:23,773 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2020-09-04 23:24:23,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-09-04 23:24:23,774 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:24:23,774 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1, 1] [2020-09-04 23:24:23,775 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-04 23:24:23,775 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:24:23,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:24:23,775 INFO L82 PathProgramCache]: Analyzing trace with hash 1258107707, now seen corresponding path program 1 times [2020-09-04 23:24:23,775 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:24:23,776 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1283953129] [2020-09-04 23:24:23,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:24:23,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:24,779 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:24:24,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:24,827 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:24:24,828 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1283953129] [2020-09-04 23:24:24,828 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:24:24,828 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-09-04 23:24:24,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1306950034] [2020-09-04 23:24:24,829 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-09-04 23:24:24,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:24:24,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-09-04 23:24:24,830 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=295, Unknown=0, NotChecked=0, Total=342 [2020-09-04 23:24:24,830 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 19 states. [2020-09-04 23:24:26,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:24:26,061 INFO L93 Difference]: Finished difference Result 65 states and 73 transitions. [2020-09-04 23:24:26,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-09-04 23:24:26,062 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 37 [2020-09-04 23:24:26,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:24:26,063 INFO L225 Difference]: With dead ends: 65 [2020-09-04 23:24:26,063 INFO L226 Difference]: Without dead ends: 50 [2020-09-04 23:24:26,065 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=172, Invalid=884, Unknown=0, NotChecked=0, Total=1056 [2020-09-04 23:24:26,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-09-04 23:24:26,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 45. [2020-09-04 23:24:26,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-09-04 23:24:26,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2020-09-04 23:24:26,079 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 37 [2020-09-04 23:24:26,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:24:26,079 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2020-09-04 23:24:26,079 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-09-04 23:24:26,079 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2020-09-04 23:24:26,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-09-04 23:24:26,080 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:24:26,081 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:24:26,081 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-09-04 23:24:26,081 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:24:26,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:24:26,082 INFO L82 PathProgramCache]: Analyzing trace with hash -397003539, now seen corresponding path program 2 times [2020-09-04 23:24:26,082 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:24:26,082 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [128355339] [2020-09-04 23:24:26,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:24:26,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:27,142 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:24:27,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:27,202 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:24:27,203 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [128355339] [2020-09-04 23:24:27,203 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:24:27,203 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-09-04 23:24:27,204 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859328826] [2020-09-04 23:24:27,204 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-09-04 23:24:27,204 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:24:27,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-09-04 23:24:27,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=367, Unknown=0, NotChecked=0, Total=420 [2020-09-04 23:24:27,205 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand 21 states. [2020-09-04 23:24:28,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:24:28,639 INFO L93 Difference]: Finished difference Result 69 states and 77 transitions. [2020-09-04 23:24:28,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-09-04 23:24:28,639 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 41 [2020-09-04 23:24:28,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:24:28,641 INFO L225 Difference]: With dead ends: 69 [2020-09-04 23:24:28,641 INFO L226 Difference]: Without dead ends: 54 [2020-09-04 23:24:28,642 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=195, Invalid=1137, Unknown=0, NotChecked=0, Total=1332 [2020-09-04 23:24:28,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-09-04 23:24:28,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 49. [2020-09-04 23:24:28,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-09-04 23:24:28,658 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2020-09-04 23:24:28,658 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 41 [2020-09-04 23:24:28,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:24:28,659 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2020-09-04 23:24:28,659 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-09-04 23:24:28,659 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2020-09-04 23:24:28,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-09-04 23:24:28,660 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:24:28,660 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 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, 1] [2020-09-04 23:24:28,660 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-09-04 23:24:28,660 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:24:28,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:24:28,661 INFO L82 PathProgramCache]: Analyzing trace with hash 1225985439, now seen corresponding path program 3 times [2020-09-04 23:24:28,661 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:24:28,661 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1888968684] [2020-09-04 23:24:28,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:24:28,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:29,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:24:29,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:29,287 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 39 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:24:29,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1888968684] [2020-09-04 23:24:29,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:24:29,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-09-04 23:24:29,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [468202695] [2020-09-04 23:24:29,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-09-04 23:24:29,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:24:29,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-09-04 23:24:29,296 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2020-09-04 23:24:29,296 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand 13 states. [2020-09-04 23:24:32,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:24:32,299 INFO L93 Difference]: Finished difference Result 66 states and 72 transitions. [2020-09-04 23:24:32,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-09-04 23:24:32,300 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 45 [2020-09-04 23:24:32,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:24:32,301 INFO L225 Difference]: With dead ends: 66 [2020-09-04 23:24:32,301 INFO L226 Difference]: Without dead ends: 54 [2020-09-04 23:24:32,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=75, Invalid=305, Unknown=0, NotChecked=0, Total=380 [2020-09-04 23:24:32,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-09-04 23:24:32,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 50. [2020-09-04 23:24:32,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-09-04 23:24:32,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-09-04 23:24:32,331 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 45 [2020-09-04 23:24:32,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:24:32,331 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-09-04 23:24:32,331 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-09-04 23:24:32,332 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-09-04 23:24:32,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-09-04 23:24:32,338 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:24:32,338 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:24:32,339 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-09-04 23:24:32,339 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:24:32,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:24:32,339 INFO L82 PathProgramCache]: Analyzing trace with hash -1343864940, now seen corresponding path program 4 times [2020-09-04 23:24:32,339 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:24:32,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [913614089] [2020-09-04 23:24:32,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:24:32,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:33,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:24:33,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:33,767 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:24:33,767 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [913614089] [2020-09-04 23:24:33,768 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:24:33,768 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-09-04 23:24:33,768 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [19196699] [2020-09-04 23:24:33,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-09-04 23:24:33,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:24:33,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-09-04 23:24:33,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=447, Unknown=0, NotChecked=0, Total=506 [2020-09-04 23:24:33,769 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 23 states. [2020-09-04 23:24:37,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:24:37,635 INFO L93 Difference]: Finished difference Result 74 states and 82 transitions. [2020-09-04 23:24:37,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-09-04 23:24:37,636 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 46 [2020-09-04 23:24:37,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:24:37,638 INFO L225 Difference]: With dead ends: 74 [2020-09-04 23:24:37,638 INFO L226 Difference]: Without dead ends: 59 [2020-09-04 23:24:37,640 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=218, Invalid=1422, Unknown=0, NotChecked=0, Total=1640 [2020-09-04 23:24:37,640 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-09-04 23:24:37,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 54. [2020-09-04 23:24:37,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-09-04 23:24:37,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-09-04 23:24:37,654 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 46 [2020-09-04 23:24:37,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:24:37,655 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-09-04 23:24:37,655 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-09-04 23:24:37,655 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-09-04 23:24:37,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-09-04 23:24:37,656 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:24:37,656 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:24:37,656 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-09-04 23:24:37,656 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:24:37,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:24:37,657 INFO L82 PathProgramCache]: Analyzing trace with hash 1589603526, now seen corresponding path program 5 times [2020-09-04 23:24:37,657 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:24:37,657 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1000226533] [2020-09-04 23:24:37,657 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:24:37,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:42,301 WARN L193 SmtUtils]: Spent 4.18 s on a formula simplification. DAG size of input: 45 DAG size of output: 35 [2020-09-04 23:24:42,338 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:24:42,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:42,389 INFO L134 CoverageAnalysis]: Checked inductivity of 58 backedges. 13 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:24:42,390 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1000226533] [2020-09-04 23:24:42,390 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:24:42,390 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-09-04 23:24:42,390 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1493670897] [2020-09-04 23:24:42,391 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-09-04 23:24:42,391 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:24:42,391 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-09-04 23:24:42,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2020-09-04 23:24:42,392 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 12 states. [2020-09-04 23:24:43,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:24:43,566 INFO L93 Difference]: Finished difference Result 71 states and 77 transitions. [2020-09-04 23:24:43,567 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-09-04 23:24:43,567 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 50 [2020-09-04 23:24:43,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:24:43,568 INFO L225 Difference]: With dead ends: 71 [2020-09-04 23:24:43,568 INFO L226 Difference]: Without dead ends: 59 [2020-09-04 23:24:43,569 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=78, Invalid=302, Unknown=0, NotChecked=0, Total=380 [2020-09-04 23:24:43,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-09-04 23:24:43,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 55. [2020-09-04 23:24:43,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-09-04 23:24:43,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2020-09-04 23:24:43,583 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 50 [2020-09-04 23:24:43,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:24:43,583 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2020-09-04 23:24:43,583 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-09-04 23:24:43,583 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2020-09-04 23:24:43,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-09-04 23:24:43,585 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:24:43,585 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:24:43,585 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-09-04 23:24:43,585 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:24:43,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:24:43,586 INFO L82 PathProgramCache]: Analyzing trace with hash 1338361165, now seen corresponding path program 6 times [2020-09-04 23:24:43,586 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:24:43,586 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1309009949] [2020-09-04 23:24:43,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:24:43,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:43,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:24:43,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:43,746 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:24:43,746 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1309009949] [2020-09-04 23:24:43,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:24:43,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-09-04 23:24:43,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561336712] [2020-09-04 23:24:43,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-04 23:24:43,748 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:24:43,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-04 23:24:43,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-09-04 23:24:43,748 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand 9 states. [2020-09-04 23:24:44,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:24:44,101 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-09-04 23:24:44,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-04 23:24:44,102 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 51 [2020-09-04 23:24:44,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:24:44,103 INFO L225 Difference]: With dead ends: 70 [2020-09-04 23:24:44,103 INFO L226 Difference]: Without dead ends: 58 [2020-09-04 23:24:44,104 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=39, Invalid=171, Unknown=0, NotChecked=0, Total=210 [2020-09-04 23:24:44,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-09-04 23:24:44,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 56. [2020-09-04 23:24:44,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-09-04 23:24:44,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-09-04 23:24:44,122 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 51 [2020-09-04 23:24:44,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:24:44,123 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-09-04 23:24:44,123 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-04 23:24:44,123 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-09-04 23:24:44,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-09-04 23:24:44,124 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:24:44,124 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:24:44,124 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-09-04 23:24:44,125 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:24:44,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:24:44,125 INFO L82 PathProgramCache]: Analyzing trace with hash 639368621, now seen corresponding path program 7 times [2020-09-04 23:24:44,125 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:24:44,126 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [460255658] [2020-09-04 23:24:44,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:24:44,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:45,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:24:45,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:45,697 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:24:45,697 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [460255658] [2020-09-04 23:24:45,697 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:24:45,698 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-09-04 23:24:45,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567807563] [2020-09-04 23:24:45,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-09-04 23:24:45,699 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:24:45,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-09-04 23:24:45,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=535, Unknown=0, NotChecked=0, Total=600 [2020-09-04 23:24:45,700 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 25 states. [2020-09-04 23:24:48,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:24:48,096 INFO L93 Difference]: Finished difference Result 69 states and 73 transitions. [2020-09-04 23:24:48,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-09-04 23:24:48,097 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 51 [2020-09-04 23:24:48,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:24:48,098 INFO L225 Difference]: With dead ends: 69 [2020-09-04 23:24:48,098 INFO L226 Difference]: Without dead ends: 64 [2020-09-04 23:24:48,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=241, Invalid=1739, Unknown=0, NotChecked=0, Total=1980 [2020-09-04 23:24:48,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-09-04 23:24:48,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 59. [2020-09-04 23:24:48,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-09-04 23:24:48,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 61 transitions. [2020-09-04 23:24:48,115 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 61 transitions. Word has length 51 [2020-09-04 23:24:48,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:24:48,115 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 61 transitions. [2020-09-04 23:24:48,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-09-04 23:24:48,116 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 61 transitions. [2020-09-04 23:24:48,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-09-04 23:24:48,116 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:24:48,117 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 4, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:24:48,117 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-09-04 23:24:48,117 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:24:48,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:24:48,117 INFO L82 PathProgramCache]: Analyzing trace with hash 692483679, now seen corresponding path program 8 times [2020-09-04 23:24:48,118 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:24:48,118 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1328198397] [2020-09-04 23:24:48,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:24:48,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:49,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:24:49,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:49,945 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:24:49,945 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1328198397] [2020-09-04 23:24:49,945 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:24:49,945 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-09-04 23:24:49,945 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130882795] [2020-09-04 23:24:49,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-09-04 23:24:49,946 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:24:49,946 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-09-04 23:24:49,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=631, Unknown=0, NotChecked=0, Total=702 [2020-09-04 23:24:49,947 INFO L87 Difference]: Start difference. First operand 59 states and 61 transitions. Second operand 27 states. [2020-09-04 23:24:52,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:24:52,651 INFO L93 Difference]: Finished difference Result 83 states and 91 transitions. [2020-09-04 23:24:52,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-09-04 23:24:52,652 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 55 [2020-09-04 23:24:52,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:24:52,653 INFO L225 Difference]: With dead ends: 83 [2020-09-04 23:24:52,653 INFO L226 Difference]: Without dead ends: 68 [2020-09-04 23:24:52,655 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=264, Invalid=2088, Unknown=0, NotChecked=0, Total=2352 [2020-09-04 23:24:52,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-09-04 23:24:52,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 63. [2020-09-04 23:24:52,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-09-04 23:24:52,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 65 transitions. [2020-09-04 23:24:52,676 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 65 transitions. Word has length 55 [2020-09-04 23:24:52,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:24:52,677 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 65 transitions. [2020-09-04 23:24:52,677 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-09-04 23:24:52,677 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 65 transitions. [2020-09-04 23:24:52,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-09-04 23:24:52,678 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:24:52,678 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 4, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:24:52,678 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-09-04 23:24:52,678 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:24:52,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:24:52,679 INFO L82 PathProgramCache]: Analyzing trace with hash 742475281, now seen corresponding path program 9 times [2020-09-04 23:24:52,679 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:24:52,679 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1400834661] [2020-09-04 23:24:52,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:24:52,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:53,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:24:53,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:24:53,805 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 0 proven. 106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:24:53,805 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1400834661] [2020-09-04 23:24:53,806 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:24:53,806 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-09-04 23:24:53,806 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815133291] [2020-09-04 23:24:53,807 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-09-04 23:24:53,807 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:24:53,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-09-04 23:24:53,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=208, Unknown=0, NotChecked=0, Total=240 [2020-09-04 23:24:53,807 INFO L87 Difference]: Start difference. First operand 63 states and 65 transitions. Second operand 16 states. [2020-09-04 23:25:01,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:25:01,990 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-09-04 23:25:01,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-09-04 23:25:01,991 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 59 [2020-09-04 23:25:01,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:25:01,992 INFO L225 Difference]: With dead ends: 80 [2020-09-04 23:25:01,992 INFO L226 Difference]: Without dead ends: 68 [2020-09-04 23:25:01,993 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=102, Invalid=548, Unknown=0, NotChecked=0, Total=650 [2020-09-04 23:25:01,993 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-09-04 23:25:02,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 64. [2020-09-04 23:25:02,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-09-04 23:25:02,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-09-04 23:25:02,013 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 59 [2020-09-04 23:25:02,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:25:02,013 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-09-04 23:25:02,013 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-09-04 23:25:02,013 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-09-04 23:25:02,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-09-04 23:25:02,014 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:25:02,014 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:25:02,015 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-09-04 23:25:02,015 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:25:02,015 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:25:02,015 INFO L82 PathProgramCache]: Analyzing trace with hash 847189346, now seen corresponding path program 10 times [2020-09-04 23:25:02,015 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:25:02,016 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [392631586] [2020-09-04 23:25:02,016 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:25:02,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:25:02,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:25:02,203 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:25:02,209 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 17 proven. 92 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:25:02,210 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [392631586] [2020-09-04 23:25:02,210 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:25:02,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-09-04 23:25:02,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1792941113] [2020-09-04 23:25:02,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-04 23:25:02,211 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:25:02,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-04 23:25:02,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-09-04 23:25:02,212 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 11 states. [2020-09-04 23:25:02,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:25:02,890 INFO L93 Difference]: Finished difference Result 79 states and 84 transitions. [2020-09-04 23:25:02,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-09-04 23:25:02,892 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 60 [2020-09-04 23:25:02,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:25:02,893 INFO L225 Difference]: With dead ends: 79 [2020-09-04 23:25:02,893 INFO L226 Difference]: Without dead ends: 67 [2020-09-04 23:25:02,894 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-09-04 23:25:02,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-09-04 23:25:02,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 65. [2020-09-04 23:25:02,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-09-04 23:25:02,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 67 transitions. [2020-09-04 23:25:02,922 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 67 transitions. Word has length 60 [2020-09-04 23:25:02,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:25:02,922 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 67 transitions. [2020-09-04 23:25:02,922 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-04 23:25:02,923 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 67 transitions. [2020-09-04 23:25:02,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-09-04 23:25:02,923 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:25:02,924 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 5, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:25:02,924 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-09-04 23:25:02,924 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:25:02,924 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:25:02,924 INFO L82 PathProgramCache]: Analyzing trace with hash 148196802, now seen corresponding path program 11 times [2020-09-04 23:25:02,925 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:25:02,925 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2061340192] [2020-09-04 23:25:02,925 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:25:02,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:25:04,964 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:25:04,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:25:05,059 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 0 proven. 109 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:25:05,060 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2061340192] [2020-09-04 23:25:05,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:25:05,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-09-04 23:25:05,060 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909394565] [2020-09-04 23:25:05,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-09-04 23:25:05,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:25:05,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-09-04 23:25:05,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=735, Unknown=0, NotChecked=0, Total=812 [2020-09-04 23:25:05,062 INFO L87 Difference]: Start difference. First operand 65 states and 67 transitions. Second operand 29 states. [2020-09-04 23:25:08,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:25:08,225 INFO L93 Difference]: Finished difference Result 78 states and 82 transitions. [2020-09-04 23:25:08,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-09-04 23:25:08,226 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 60 [2020-09-04 23:25:08,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:25:08,227 INFO L225 Difference]: With dead ends: 78 [2020-09-04 23:25:08,227 INFO L226 Difference]: Without dead ends: 73 [2020-09-04 23:25:08,228 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 347 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=287, Invalid=2469, Unknown=0, NotChecked=0, Total=2756 [2020-09-04 23:25:08,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-09-04 23:25:08,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 68. [2020-09-04 23:25:08,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-09-04 23:25:08,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-09-04 23:25:08,252 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 60 [2020-09-04 23:25:08,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:25:08,252 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-09-04 23:25:08,252 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-09-04 23:25:08,252 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-09-04 23:25:08,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-09-04 23:25:08,253 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:25:08,253 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:25:08,254 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-09-04 23:25:08,254 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:25:08,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:25:08,254 INFO L82 PathProgramCache]: Analyzing trace with hash 1879028724, now seen corresponding path program 12 times [2020-09-04 23:25:08,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:25:08,255 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [731223059] [2020-09-04 23:25:08,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:25:08,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:25:36,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:25:36,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:25:36,382 INFO L134 CoverageAnalysis]: Checked inductivity of 137 backedges. 20 proven. 103 refuted. 14 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:25:36,382 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [731223059] [2020-09-04 23:25:36,383 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:25:36,383 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-09-04 23:25:36,383 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019638113] [2020-09-04 23:25:36,383 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-09-04 23:25:36,384 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:25:36,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-09-04 23:25:36,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=188, Unknown=11, NotChecked=0, Total=240 [2020-09-04 23:25:36,384 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 16 states. [2020-09-04 23:26:05,432 WARN L838 $PredicateComparison]: unable to prove that (and (<= (+ (* 12884901888 (div (+ (* c_main_~l~0 2863311531) (- 1431655767)) 4294967296)) c_main_~n~0 17159869185) (+ (* 4294967296 (div c_main_~n~0 4294967296)) (* 8589934593 c_main_~l~0))) (= c_~SIZE~0 |c_old(~SIZE~0)|) (<= (let ((.cse2 (div c_main_~l~0 4294967296))) (let ((.cse1 (* .cse2 (- 4294967296)))) (let ((.cse0 (div (+ c_main_~l~0 .cse1) 3))) (+ (* 6 .cse0) (* 8589934593 (div (+ (* .cse0 (- 3)) c_main_~l~0 .cse1) 4294967296)) (* 8589934592 .cse2) 1)))) (* 2 c_main_~l~0))) is different from false [2020-09-04 23:26:44,437 WARN L193 SmtUtils]: Spent 2.11 s on a formula simplification that was a NOOP. DAG size: 42 [2020-09-04 23:26:54,707 WARN L193 SmtUtils]: Spent 4.07 s on a formula simplification that was a NOOP. DAG size: 40 [2020-09-04 23:27:35,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:27:35,784 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-09-04 23:27:35,786 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-09-04 23:27:35,786 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 64 [2020-09-04 23:27:35,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:27:35,787 INFO L225 Difference]: With dead ends: 82 [2020-09-04 23:27:35,788 INFO L226 Difference]: Without dead ends: 70 [2020-09-04 23:27:35,789 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 97.5s TimeCoverageRelationStatistics Valid=169, Invalid=788, Unknown=39, NotChecked=60, Total=1056 [2020-09-04 23:27:35,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-09-04 23:27:35,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-09-04 23:27:35,809 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-09-04 23:27:35,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2020-09-04 23:27:35,811 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 64 [2020-09-04 23:27:35,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:27:35,812 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2020-09-04 23:27:35,812 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-09-04 23:27:35,812 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2020-09-04 23:27:35,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-09-04 23:27:35,812 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:27:35,812 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 6, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:27:35,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-09-04 23:27:35,813 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:27:35,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:27:35,813 INFO L82 PathProgramCache]: Analyzing trace with hash 1720607711, now seen corresponding path program 13 times [2020-09-04 23:27:35,813 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:27:35,813 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [177306988] [2020-09-04 23:27:35,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:27:35,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:27:38,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:27:38,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:27:38,293 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 0 proven. 141 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:27:38,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [177306988] [2020-09-04 23:27:38,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:27:38,294 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-09-04 23:27:38,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143032328] [2020-09-04 23:27:38,296 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-09-04 23:27:38,296 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:27:38,296 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-09-04 23:27:38,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=847, Unknown=0, NotChecked=0, Total=930 [2020-09-04 23:27:38,297 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand 31 states. [2020-09-04 23:27:42,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:27:42,155 INFO L93 Difference]: Finished difference Result 93 states and 101 transitions. [2020-09-04 23:27:42,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-09-04 23:27:42,155 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 65 [2020-09-04 23:27:42,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:27:42,156 INFO L225 Difference]: With dead ends: 93 [2020-09-04 23:27:42,156 INFO L226 Difference]: Without dead ends: 78 [2020-09-04 23:27:42,158 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=310, Invalid=2882, Unknown=0, NotChecked=0, Total=3192 [2020-09-04 23:27:42,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-09-04 23:27:42,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 73. [2020-09-04 23:27:42,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-09-04 23:27:42,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 75 transitions. [2020-09-04 23:27:42,185 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 75 transitions. Word has length 65 [2020-09-04 23:27:42,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:27:42,185 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 75 transitions. [2020-09-04 23:27:42,185 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-09-04 23:27:42,185 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 75 transitions. [2020-09-04 23:27:42,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-09-04 23:27:42,186 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:27:42,186 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 6, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:27:42,186 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-09-04 23:27:42,186 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:27:42,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:27:42,187 INFO L82 PathProgramCache]: Analyzing trace with hash -2133429359, now seen corresponding path program 14 times [2020-09-04 23:27:42,187 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:27:42,187 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2039009720] [2020-09-04 23:27:42,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:27:42,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:27:44,849 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 31 [2020-09-04 23:27:45,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:27:45,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:27:45,420 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 0 proven. 172 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:27:45,421 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2039009720] [2020-09-04 23:27:45,421 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:27:45,421 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-09-04 23:27:45,421 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1952835028] [2020-09-04 23:27:45,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-09-04 23:27:45,422 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:27:45,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-09-04 23:27:45,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=967, Unknown=0, NotChecked=0, Total=1056 [2020-09-04 23:27:45,423 INFO L87 Difference]: Start difference. First operand 73 states and 75 transitions. Second operand 33 states. [2020-09-04 23:27:49,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:27:49,900 INFO L93 Difference]: Finished difference Result 97 states and 105 transitions. [2020-09-04 23:27:49,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-09-04 23:27:49,902 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 69 [2020-09-04 23:27:49,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:27:49,903 INFO L225 Difference]: With dead ends: 97 [2020-09-04 23:27:49,904 INFO L226 Difference]: Without dead ends: 82 [2020-09-04 23:27:49,905 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 460 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=333, Invalid=3327, Unknown=0, NotChecked=0, Total=3660 [2020-09-04 23:27:49,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-09-04 23:27:49,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 77. [2020-09-04 23:27:49,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-09-04 23:27:49,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2020-09-04 23:27:49,926 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 69 [2020-09-04 23:27:49,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:27:49,927 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2020-09-04 23:27:49,927 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-09-04 23:27:49,927 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2020-09-04 23:27:49,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-09-04 23:27:49,928 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:27:49,928 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 6, 5, 5, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:27:49,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-09-04 23:27:49,928 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:27:49,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:27:49,929 INFO L82 PathProgramCache]: Analyzing trace with hash 340482627, now seen corresponding path program 15 times [2020-09-04 23:27:49,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:27:49,929 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1405531425] [2020-09-04 23:27:49,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:27:49,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:28:33,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:28:33,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:28:33,265 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 25 proven. 136 refuted. 46 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:28:33,265 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1405531425] [2020-09-04 23:28:33,265 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:28:33,265 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-09-04 23:28:33,265 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [815591890] [2020-09-04 23:28:33,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-09-04 23:28:33,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:28:33,266 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-09-04 23:28:33,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=240, Unknown=19, NotChecked=0, Total=306 [2020-09-04 23:28:33,267 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand 18 states. [2020-09-04 23:28:57,404 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse3 (+ (* 4294967296 (div c_main_~n~0 4294967296)) (* 8589934593 c_main_~l~0)))) (and (<= (let ((.cse2 (div c_main_~l~0 4294967296))) (let ((.cse1 (* .cse2 (- 4294967296)))) (let ((.cse0 (div (+ c_main_~l~0 .cse1) 3))) (+ (* 25769803776 .cse0) (* 36893488151714070528 (div (+ (* .cse0 (- 3)) c_main_~l~0 .cse1) 4294967296)) c_main_~n~0 (* 36893488151714070528 .cse2) 8569934601)))) .cse3) (<= (+ (* 12884901888 (div (+ (* c_main_~l~0 2863311531) (- 1431655767)) 4294967296)) c_main_~n~0 17159869185) .cse3) (= c_~SIZE~0 |c_old(~SIZE~0)|))) is different from false [2020-09-04 23:29:38,529 WARN L193 SmtUtils]: Spent 2.11 s on a formula simplification that was a NOOP. DAG size: 40 [2020-09-04 23:30:35,812 WARN L193 SmtUtils]: Spent 1.62 s on a formula simplification that was a NOOP. DAG size: 41 [2020-09-04 23:31:16,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:31:16,899 INFO L93 Difference]: Finished difference Result 95 states and 101 transitions. [2020-09-04 23:31:16,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-09-04 23:31:16,900 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 73 [2020-09-04 23:31:16,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:31:16,901 INFO L225 Difference]: With dead ends: 95 [2020-09-04 23:31:16,901 INFO L226 Difference]: Without dead ends: 83 [2020-09-04 23:31:16,902 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 108.9s TimeCoverageRelationStatistics Valid=192, Invalid=1104, Unknown=40, NotChecked=70, Total=1406 [2020-09-04 23:31:16,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-09-04 23:31:16,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 78. [2020-09-04 23:31:16,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-09-04 23:31:16,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-09-04 23:31:16,926 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 73 [2020-09-04 23:31:16,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:31:16,927 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-09-04 23:31:16,927 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-09-04 23:31:16,927 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-09-04 23:31:16,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-09-04 23:31:16,928 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:31:16,928 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 7, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:31:16,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-09-04 23:31:16,928 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:31:16,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:31:16,929 INFO L82 PathProgramCache]: Analyzing trace with hash 1270318960, now seen corresponding path program 16 times [2020-09-04 23:31:16,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:31:16,929 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [601838470] [2020-09-04 23:31:16,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:31:16,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:31:23,288 WARN L193 SmtUtils]: Spent 4.20 s on a formula simplification. DAG size of input: 43 DAG size of output: 28 [2020-09-04 23:31:25,809 WARN L193 SmtUtils]: Spent 2.15 s on a formula simplification. DAG size of input: 45 DAG size of output: 42 [2020-09-04 23:31:26,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:31:26,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:31:27,070 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:31:27,071 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [601838470] [2020-09-04 23:31:27,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:31:27,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-09-04 23:31:27,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360048825] [2020-09-04 23:31:27,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-09-04 23:31:27,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:31:27,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-09-04 23:31:27,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1095, Unknown=0, NotChecked=0, Total=1190 [2020-09-04 23:31:27,073 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-09-04 23:31:33,670 WARN L193 SmtUtils]: Spent 2.10 s on a formula simplification that was a NOOP. DAG size: 35 [2020-09-04 23:31:36,164 WARN L193 SmtUtils]: Spent 2.10 s on a formula simplification that was a NOOP. DAG size: 47 [2020-09-04 23:31:37,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:31:37,286 INFO L93 Difference]: Finished difference Result 102 states and 110 transitions. [2020-09-04 23:31:37,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-09-04 23:31:37,288 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 74 [2020-09-04 23:31:37,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:31:37,289 INFO L225 Difference]: With dead ends: 102 [2020-09-04 23:31:37,289 INFO L226 Difference]: Without dead ends: 87 [2020-09-04 23:31:37,291 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 524 ImplicationChecksByTransitivity, 16.7s TimeCoverageRelationStatistics Valid=356, Invalid=3804, Unknown=0, NotChecked=0, Total=4160 [2020-09-04 23:31:37,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-09-04 23:31:37,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 82. [2020-09-04 23:31:37,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-09-04 23:31:37,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-09-04 23:31:37,314 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 74 [2020-09-04 23:31:37,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:31:37,314 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-09-04 23:31:37,314 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-09-04 23:31:37,314 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-09-04 23:31:37,314 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-09-04 23:31:37,314 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:31:37,315 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 7, 5, 5, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:31:37,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-09-04 23:31:37,315 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:31:37,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:31:37,315 INFO L82 PathProgramCache]: Analyzing trace with hash -1632541022, now seen corresponding path program 17 times [2020-09-04 23:31:37,315 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:31:37,315 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [313370216] [2020-09-04 23:31:37,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:31:37,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:32:51,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:32:51,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:32:51,856 INFO L134 CoverageAnalysis]: Checked inductivity of 250 backedges. 27 proven. 164 refuted. 59 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:32:51,856 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [313370216] [2020-09-04 23:32:51,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:32:51,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-09-04 23:32:51,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467229068] [2020-09-04 23:32:51,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-09-04 23:32:51,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:32:51,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-09-04 23:32:51,857 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=256, Unknown=34, NotChecked=0, Total=342 [2020-09-04 23:32:51,858 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 19 states. [2020-09-04 23:33:38,129 WARN L193 SmtUtils]: Spent 7.98 s on a formula simplification that was a NOOP. DAG size: 42 [2020-09-04 23:34:11,084 WARN L193 SmtUtils]: Spent 2.12 s on a formula simplification that was a NOOP. DAG size: 42 [2020-09-04 23:34:45,761 WARN L193 SmtUtils]: Spent 4.10 s on a formula simplification that was a NOOP. DAG size: 42 [2020-09-04 23:36:10,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:36:10,939 INFO L93 Difference]: Finished difference Result 96 states and 101 transitions. [2020-09-04 23:36:10,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-09-04 23:36:10,941 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 78 [2020-09-04 23:36:10,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:36:10,942 INFO L225 Difference]: With dead ends: 96 [2020-09-04 23:36:10,942 INFO L226 Difference]: Without dead ends: 84 [2020-09-04 23:36:10,943 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 308 ImplicationChecksByTransitivity, 196.0s TimeCoverageRelationStatistics Valid=203, Invalid=1286, Unknown=71, NotChecked=0, Total=1560 [2020-09-04 23:36:10,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-09-04 23:36:10,966 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-09-04 23:36:10,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-09-04 23:36:10,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2020-09-04 23:36:10,967 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 78 [2020-09-04 23:36:10,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:36:10,967 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2020-09-04 23:36:10,967 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-09-04 23:36:10,968 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2020-09-04 23:36:10,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-09-04 23:36:10,968 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:36:10,968 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 8, 5, 5, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:36:10,968 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-09-04 23:36:10,968 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:36:10,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:36:10,969 INFO L82 PathProgramCache]: Analyzing trace with hash 236127985, now seen corresponding path program 18 times [2020-09-04 23:36:10,969 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:36:10,969 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1441547477] [2020-09-04 23:36:10,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:36:10,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:36:11,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:36:11,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:36:11,393 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 27 proven. 230 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:36:11,394 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1441547477] [2020-09-04 23:36:11,394 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:36:11,394 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-09-04 23:36:11,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720941783] [2020-09-04 23:36:11,395 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-09-04 23:36:11,395 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:36:11,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-09-04 23:36:11,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-09-04 23:36:11,395 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand 15 states. [2020-09-04 23:36:13,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:36:13,010 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-09-04 23:36:13,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-09-04 23:36:13,011 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 79 [2020-09-04 23:36:13,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:36:13,012 INFO L225 Difference]: With dead ends: 98 [2020-09-04 23:36:13,013 INFO L226 Difference]: Without dead ends: 86 [2020-09-04 23:36:13,014 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-09-04 23:36:13,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-09-04 23:36:13,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 84. [2020-09-04 23:36:13,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-09-04 23:36:13,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-09-04 23:36:13,038 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 79 [2020-09-04 23:36:13,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:36:13,038 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-09-04 23:36:13,038 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-09-04 23:36:13,038 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-09-04 23:36:13,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-09-04 23:36:13,039 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:36:13,039 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 8, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:36:13,039 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-09-04 23:36:13,039 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:36:13,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:36:13,039 INFO L82 PathProgramCache]: Analyzing trace with hash -462864559, now seen corresponding path program 19 times [2020-09-04 23:36:13,039 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:36:13,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [157334295] [2020-09-04 23:36:13,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:36:13,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:36:16,436 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 30 [2020-09-04 23:36:17,059 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:36:17,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:36:17,209 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:36:17,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [157334295] [2020-09-04 23:36:17,209 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:36:17,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-09-04 23:36:17,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556734634] [2020-09-04 23:36:17,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-09-04 23:36:17,210 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:36:17,210 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-09-04 23:36:17,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1231, Unknown=0, NotChecked=0, Total=1332 [2020-09-04 23:36:17,211 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 37 states. [2020-09-04 23:36:24,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:36:24,429 INFO L93 Difference]: Finished difference Result 97 states and 101 transitions. [2020-09-04 23:36:24,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-09-04 23:36:24,431 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 79 [2020-09-04 23:36:24,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:36:24,432 INFO L225 Difference]: With dead ends: 97 [2020-09-04 23:36:24,432 INFO L226 Difference]: Without dead ends: 92 [2020-09-04 23:36:24,434 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 587 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=379, Invalid=4313, Unknown=0, NotChecked=0, Total=4692 [2020-09-04 23:36:24,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-09-04 23:36:24,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 87. [2020-09-04 23:36:24,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-09-04 23:36:24,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 89 transitions. [2020-09-04 23:36:24,466 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 89 transitions. Word has length 79 [2020-09-04 23:36:24,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:36:24,466 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 89 transitions. [2020-09-04 23:36:24,467 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-09-04 23:36:24,467 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 89 transitions. [2020-09-04 23:36:24,467 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-09-04 23:36:24,467 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:36:24,467 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 8, 5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:36:24,467 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-09-04 23:36:24,467 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:36:24,468 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:36:24,468 INFO L82 PathProgramCache]: Analyzing trace with hash -1777187325, now seen corresponding path program 20 times [2020-09-04 23:36:24,468 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:36:24,468 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1820637732] [2020-09-04 23:36:24,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:36:24,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:36:29,978 WARN L193 SmtUtils]: Spent 2.16 s on a formula simplification. DAG size of input: 35 DAG size of output: 17 [2020-09-04 23:36:31,435 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 31 [2020-09-04 23:36:31,779 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 19 [2020-09-04 23:36:32,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:36:32,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:36:32,315 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 0 proven. 297 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:36:32,316 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1820637732] [2020-09-04 23:36:32,316 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:36:32,317 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-09-04 23:36:32,317 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713443844] [2020-09-04 23:36:32,318 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-09-04 23:36:32,318 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:36:32,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-09-04 23:36:32,319 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1375, Unknown=0, NotChecked=0, Total=1482 [2020-09-04 23:36:32,319 INFO L87 Difference]: Start difference. First operand 87 states and 89 transitions. Second operand 39 states. [2020-09-04 23:36:40,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 23:36:40,136 INFO L93 Difference]: Finished difference Result 111 states and 119 transitions. [2020-09-04 23:36:40,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-09-04 23:36:40,138 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 83 [2020-09-04 23:36:40,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 23:36:40,139 INFO L225 Difference]: With dead ends: 111 [2020-09-04 23:36:40,139 INFO L226 Difference]: Without dead ends: 96 [2020-09-04 23:36:40,142 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 71 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 658 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=402, Invalid=4854, Unknown=0, NotChecked=0, Total=5256 [2020-09-04 23:36:40,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-09-04 23:36:40,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 91. [2020-09-04 23:36:40,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-09-04 23:36:40,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 93 transitions. [2020-09-04 23:36:40,170 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 93 transitions. Word has length 83 [2020-09-04 23:36:40,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 23:36:40,170 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 93 transitions. [2020-09-04 23:36:40,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-09-04 23:36:40,170 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 93 transitions. [2020-09-04 23:36:40,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-09-04 23:36:40,171 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 23:36:40,171 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 8, 6, 6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 23:36:40,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-09-04 23:36:40,172 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 23:36:40,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 23:36:40,172 INFO L82 PathProgramCache]: Analyzing trace with hash -1449876555, now seen corresponding path program 21 times [2020-09-04 23:36:40,172 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-09-04 23:36:40,172 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [497502531] [2020-09-04 23:36:40,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 23:36:40,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:37:56,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 23:37:56,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 23:37:56,198 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 32 proven. 224 refuted. 86 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 23:37:56,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [497502531] [2020-09-04 23:37:56,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-09-04 23:37:56,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-09-04 23:37:56,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [677142940] [2020-09-04 23:37:56,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-09-04 23:37:56,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-09-04 23:37:56,200 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-09-04 23:37:56,200 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=329, Unknown=33, NotChecked=0, Total=420 [2020-09-04 23:37:56,201 INFO L87 Difference]: Start difference. First operand 91 states and 93 transitions. Second operand 21 states.