/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --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/sumt5.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-7d8eed3 [2020-11-07 06:49:26,822 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-07 06:49:26,827 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-07 06:49:26,886 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-07 06:49:26,887 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-07 06:49:26,891 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-07 06:49:26,896 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-07 06:49:26,903 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-07 06:49:26,907 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-07 06:49:26,914 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-07 06:49:26,924 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-07 06:49:26,926 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-07 06:49:26,927 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-07 06:49:26,928 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-07 06:49:26,929 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-07 06:49:26,931 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-07 06:49:26,932 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-07 06:49:26,936 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-07 06:49:26,939 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-07 06:49:26,944 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-07 06:49:26,948 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-07 06:49:26,950 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-07 06:49:26,951 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-07 06:49:26,956 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-07 06:49:26,960 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-11-07 06:49:26,977 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-07 06:49:26,978 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-07 06:49:26,980 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-07 06:49:26,981 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-11-07 06:49:27,006 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-07 06:49:27,006 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-07 06:49:27,011 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-07 06:49:27,011 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-07 06:49:27,011 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-07 06:49:27,011 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-07 06:49:27,012 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-07 06:49:27,012 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-07 06:49:27,012 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-07 06:49:27,012 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-07 06:49:27,013 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-07 06:49:27,013 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-07 06:49:27,014 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-07 06:49:27,014 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-07 06:49:27,014 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-07 06:49:27,015 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-11-07 06:49:27,015 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-07 06:49:27,015 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-07 06:49:27,015 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-07 06:49:27,015 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-07 06:49:27,015 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-11-07 06:49:27,016 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-07 06:49:27,016 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-11-07 06:49:27,431 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-07 06:49:27,481 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-07 06:49:27,485 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-07 06:49:27,487 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-07 06:49:27,488 INFO L275 PluginConnector]: CDTParser initialized [2020-11-07 06:49:27,489 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/sumt5.c [2020-11-07 06:49:27,594 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ae0d0022/54133b93d7fe486e89c1233675478fbb/FLAG48abf41e9 [2020-11-07 06:49:28,250 INFO L306 CDTParser]: Found 1 translation units. [2020-11-07 06:49:28,251 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt5.c [2020-11-07 06:49:28,258 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ae0d0022/54133b93d7fe486e89c1233675478fbb/FLAG48abf41e9 [2020-11-07 06:49:28,613 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4ae0d0022/54133b93d7fe486e89c1233675478fbb [2020-11-07 06:49:28,616 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-07 06:49:28,629 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-11-07 06:49:28,636 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-07 06:49:28,636 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-07 06:49:28,640 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-07 06:49:28,641 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 06:49:28" (1/1) ... [2020-11-07 06:49:28,646 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@262328f5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:49:28, skipping insertion in model container [2020-11-07 06:49:28,646 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 06:49:28" (1/1) ... [2020-11-07 06:49:28,656 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-07 06:49:28,676 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-07 06:49:28,909 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-07 06:49:28,918 INFO L203 MainTranslator]: Completed pre-run [2020-11-07 06:49:28,940 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-07 06:49:28,956 INFO L208 MainTranslator]: Completed translation [2020-11-07 06:49:28,956 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:49:28 WrapperNode [2020-11-07 06:49:28,956 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-07 06:49:28,958 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-07 06:49:28,958 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-07 06:49:28,958 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-07 06:49:28,971 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:49:28" (1/1) ... [2020-11-07 06:49:28,971 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:49:28" (1/1) ... [2020-11-07 06:49:28,979 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:49:28" (1/1) ... [2020-11-07 06:49:28,979 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:49:28" (1/1) ... [2020-11-07 06:49:28,986 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:49:28" (1/1) ... [2020-11-07 06:49:28,991 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:49:28" (1/1) ... [2020-11-07 06:49:28,992 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:49:28" (1/1) ... [2020-11-07 06:49:28,994 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-07 06:49:28,995 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-07 06:49:28,996 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-07 06:49:28,996 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-07 06:49:28,997 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:49:28" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-07 06:49:29,077 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-07 06:49:29,078 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-07 06:49:29,078 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-11-07 06:49:29,079 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-11-07 06:49:29,079 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-11-07 06:49:29,079 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-07 06:49:29,080 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-07 06:49:29,080 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-11-07 06:49:29,080 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-11-07 06:49:29,080 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-07 06:49:29,080 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-11-07 06:49:29,081 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-11-07 06:49:29,081 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-11-07 06:49:29,081 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-07 06:49:29,082 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-07 06:49:29,082 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-07 06:49:29,083 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-07 06:49:29,083 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-07 06:49:29,083 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-07 06:49:29,084 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-07 06:49:29,372 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-07 06:49:29,372 INFO L298 CfgBuilder]: Removed 1 assume(true) statements. [2020-11-07 06:49:29,374 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 06:49:29 BoogieIcfgContainer [2020-11-07 06:49:29,375 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-07 06:49:29,377 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-07 06:49:29,377 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-07 06:49:29,381 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-07 06:49:29,381 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 06:49:28" (1/3) ... [2020-11-07 06:49:29,382 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4cc0d2c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 06:49:29, skipping insertion in model container [2020-11-07 06:49:29,382 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 06:49:28" (2/3) ... [2020-11-07 06:49:29,383 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4cc0d2c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 06:49:29, skipping insertion in model container [2020-11-07 06:49:29,383 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 06:49:29" (3/3) ... [2020-11-07 06:49:29,385 INFO L111 eAbstractionObserver]: Analyzing ICFG sumt5.c [2020-11-07 06:49:29,444 INFO L179 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-11-07 06:49:29,449 INFO L191 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-07 06:49:29,466 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-07 06:49:29,497 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-07 06:49:29,497 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-07 06:49:29,497 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-11-07 06:49:29,498 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-07 06:49:29,498 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-07 06:49:29,498 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-07 06:49:29,498 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-07 06:49:29,498 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-07 06:49:29,518 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states. [2020-11-07 06:49:29,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-11-07 06:49:29,530 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:49:29,531 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, 1, 1, 1] [2020-11-07 06:49:29,532 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:49:29,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:49:29,540 INFO L82 PathProgramCache]: Analyzing trace with hash 1036611502, now seen corresponding path program 1 times [2020-11-07 06:49:29,557 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:49:29,558 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [187590442] [2020-11-07 06:49:29,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:49:29,826 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:30,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:49:30,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:30,063 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:49:30,064 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [187590442] [2020-11-07 06:49:30,066 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 06:49:30,067 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-07 06:49:30,068 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53188917] [2020-11-07 06:49:30,075 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-07 06:49:30,076 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:49:30,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-07 06:49:30,103 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-07 06:49:30,106 INFO L87 Difference]: Start difference. First operand 52 states. Second operand 3 states. [2020-11-07 06:49:30,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:49:30,249 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-11-07 06:49:30,250 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-07 06:49:30,251 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-11-07 06:49:30,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:49:30,261 INFO L225 Difference]: With dead ends: 65 [2020-11-07 06:49:30,261 INFO L226 Difference]: Without dead ends: 41 [2020-11-07 06:49:30,265 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-07 06:49:30,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-11-07 06:49:30,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-11-07 06:49:30,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-11-07 06:49:30,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-11-07 06:49:30,328 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 30 [2020-11-07 06:49:30,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:49:30,329 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-11-07 06:49:30,329 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-07 06:49:30,329 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-11-07 06:49:30,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-11-07 06:49:30,331 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:49:30,331 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, 1, 1, 1] [2020-11-07 06:49:30,331 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-07 06:49:30,332 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:49:30,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:49:30,333 INFO L82 PathProgramCache]: Analyzing trace with hash 149107821, now seen corresponding path program 1 times [2020-11-07 06:49:30,333 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:49:30,333 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2071070354] [2020-11-07 06:49:30,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:49:30,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:30,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:49:30,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:30,699 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:49:30,699 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2071070354] [2020-11-07 06:49:30,700 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 06:49:30,700 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2020-11-07 06:49:30,700 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917339115] [2020-11-07 06:49:30,702 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-11-07 06:49:30,702 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:49:30,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-11-07 06:49:30,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-11-07 06:49:30,704 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 11 states. [2020-11-07 06:49:31,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:49:31,408 INFO L93 Difference]: Finished difference Result 101 states and 126 transitions. [2020-11-07 06:49:31,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-07 06:49:31,409 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-11-07 06:49:31,409 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:49:31,412 INFO L225 Difference]: With dead ends: 101 [2020-11-07 06:49:31,412 INFO L226 Difference]: Without dead ends: 81 [2020-11-07 06:49:31,415 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=98, Invalid=244, Unknown=0, NotChecked=0, Total=342 [2020-11-07 06:49:31,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-11-07 06:49:31,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 43. [2020-11-07 06:49:31,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-11-07 06:49:31,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-11-07 06:49:31,433 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 30 [2020-11-07 06:49:31,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:49:31,434 INFO L481 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-11-07 06:49:31,434 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-11-07 06:49:31,434 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-11-07 06:49:31,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-11-07 06:49:31,436 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:49:31,436 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, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:49:31,436 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-07 06:49:31,436 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:49:31,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:49:31,437 INFO L82 PathProgramCache]: Analyzing trace with hash 824943879, now seen corresponding path program 1 times [2020-11-07 06:49:31,438 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:49:31,438 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [62748879] [2020-11-07 06:49:31,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:49:31,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:32,203 WARN L194 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 37 [2020-11-07 06:49:32,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:49:32,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:32,427 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:49:32,428 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [62748879] [2020-11-07 06:49:32,428 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:49:32,428 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-11-07 06:49:32,429 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [126568972] [2020-11-07 06:49:32,429 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-11-07 06:49:32,429 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:49:32,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-11-07 06:49:32,431 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2020-11-07 06:49:32,431 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 18 states. [2020-11-07 06:49:33,552 WARN L194 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 62 [2020-11-07 06:49:34,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:49:34,159 INFO L93 Difference]: Finished difference Result 97 states and 120 transitions. [2020-11-07 06:49:34,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-11-07 06:49:34,167 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 34 [2020-11-07 06:49:34,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:49:34,169 INFO L225 Difference]: With dead ends: 97 [2020-11-07 06:49:34,169 INFO L226 Difference]: Without dead ends: 91 [2020-11-07 06:49:34,173 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 154 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=213, Invalid=657, Unknown=0, NotChecked=0, Total=870 [2020-11-07 06:49:34,173 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-11-07 06:49:34,213 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 46. [2020-11-07 06:49:34,214 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-11-07 06:49:34,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-11-07 06:49:34,216 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 34 [2020-11-07 06:49:34,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:49:34,216 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-11-07 06:49:34,216 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-11-07 06:49:34,217 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-11-07 06:49:34,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-11-07 06:49:34,219 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:49:34,219 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, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:49:34,220 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-07 06:49:34,220 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:49:34,222 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:49:34,222 INFO L82 PathProgramCache]: Analyzing trace with hash 674642081, now seen corresponding path program 2 times [2020-11-07 06:49:34,222 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:49:34,222 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1981845057] [2020-11-07 06:49:34,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:49:34,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:34,489 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:49:34,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:34,526 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:49:34,527 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1981845057] [2020-11-07 06:49:34,527 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:49:34,527 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-11-07 06:49:34,527 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818436550] [2020-11-07 06:49:34,528 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-07 06:49:34,528 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:49:34,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-07 06:49:34,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2020-11-07 06:49:34,529 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 8 states. [2020-11-07 06:49:35,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:49:35,070 INFO L93 Difference]: Finished difference Result 72 states and 84 transitions. [2020-11-07 06:49:35,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-07 06:49:35,071 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 38 [2020-11-07 06:49:35,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:49:35,074 INFO L225 Difference]: With dead ends: 72 [2020-11-07 06:49:35,074 INFO L226 Difference]: Without dead ends: 55 [2020-11-07 06:49:35,075 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2020-11-07 06:49:35,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-11-07 06:49:35,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 47. [2020-11-07 06:49:35,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-11-07 06:49:35,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 51 transitions. [2020-11-07 06:49:35,112 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 51 transitions. Word has length 38 [2020-11-07 06:49:35,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:49:35,113 INFO L481 AbstractCegarLoop]: Abstraction has 47 states and 51 transitions. [2020-11-07 06:49:35,113 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-07 06:49:35,113 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 51 transitions. [2020-11-07 06:49:35,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-11-07 06:49:35,115 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:49:35,115 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, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:49:35,115 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-11-07 06:49:35,116 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:49:35,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:49:35,116 INFO L82 PathProgramCache]: Analyzing trace with hash 1394265352, now seen corresponding path program 1 times [2020-11-07 06:49:35,116 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:49:35,117 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1300431944] [2020-11-07 06:49:35,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:49:35,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:35,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:49:35,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:35,225 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:49:35,225 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1300431944] [2020-11-07 06:49:35,225 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:49:35,226 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-11-07 06:49:35,226 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311652892] [2020-11-07 06:49:35,226 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-07 06:49:35,227 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:49:35,227 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-07 06:49:35,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-07 06:49:35,228 INFO L87 Difference]: Start difference. First operand 47 states and 51 transitions. Second operand 5 states. [2020-11-07 06:49:35,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:49:35,479 INFO L93 Difference]: Finished difference Result 71 states and 82 transitions. [2020-11-07 06:49:35,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-07 06:49:35,480 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 39 [2020-11-07 06:49:35,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:49:35,481 INFO L225 Difference]: With dead ends: 71 [2020-11-07 06:49:35,481 INFO L226 Difference]: Without dead ends: 54 [2020-11-07 06:49:35,482 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-11-07 06:49:35,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-11-07 06:49:35,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 48. [2020-11-07 06:49:35,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-11-07 06:49:35,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 52 transitions. [2020-11-07 06:49:35,504 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 52 transitions. Word has length 39 [2020-11-07 06:49:35,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:49:35,505 INFO L481 AbstractCegarLoop]: Abstraction has 48 states and 52 transitions. [2020-11-07 06:49:35,505 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-07 06:49:35,505 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 52 transitions. [2020-11-07 06:49:35,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-11-07 06:49:35,506 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:49:35,507 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:49:35,507 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-11-07 06:49:35,507 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:49:35,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:49:35,507 INFO L82 PathProgramCache]: Analyzing trace with hash -200289605, now seen corresponding path program 1 times [2020-11-07 06:49:35,508 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:49:35,508 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1187058598] [2020-11-07 06:49:35,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:49:35,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:37,853 WARN L194 SmtUtils]: Spent 2.11 s on a formula simplification. DAG size of input: 44 DAG size of output: 34 [2020-11-07 06:49:39,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:49:39,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:40,021 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:49:40,022 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1187058598] [2020-11-07 06:49:40,022 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:49:40,023 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-11-07 06:49:40,023 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489117823] [2020-11-07 06:49:40,023 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-11-07 06:49:40,023 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:49:40,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-11-07 06:49:40,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=86, Unknown=0, NotChecked=0, Total=110 [2020-11-07 06:49:40,024 INFO L87 Difference]: Start difference. First operand 48 states and 52 transitions. Second operand 11 states. [2020-11-07 06:49:40,513 WARN L194 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-11-07 06:49:40,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:49:40,869 INFO L93 Difference]: Finished difference Result 70 states and 80 transitions. [2020-11-07 06:49:40,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-07 06:49:40,870 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 40 [2020-11-07 06:49:40,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:49:40,871 INFO L225 Difference]: With dead ends: 70 [2020-11-07 06:49:40,872 INFO L226 Difference]: Without dead ends: 53 [2020-11-07 06:49:40,873 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=53, Invalid=157, Unknown=0, NotChecked=0, Total=210 [2020-11-07 06:49:40,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-11-07 06:49:40,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 49. [2020-11-07 06:49:40,894 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-11-07 06:49:40,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 53 transitions. [2020-11-07 06:49:40,895 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 53 transitions. Word has length 40 [2020-11-07 06:49:40,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:49:40,895 INFO L481 AbstractCegarLoop]: Abstraction has 49 states and 53 transitions. [2020-11-07 06:49:40,896 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-11-07 06:49:40,896 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 53 transitions. [2020-11-07 06:49:40,896 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-11-07 06:49:40,897 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:49:40,897 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:49:40,897 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-11-07 06:49:40,897 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:49:40,898 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:49:40,898 INFO L82 PathProgramCache]: Analyzing trace with hash -519925598, now seen corresponding path program 1 times [2020-11-07 06:49:40,898 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:49:40,898 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [807132704] [2020-11-07 06:49:40,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:49:40,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:40,976 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:49:40,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:40,985 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:49:40,986 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [807132704] [2020-11-07 06:49:40,986 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:49:40,986 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-11-07 06:49:40,987 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079439133] [2020-11-07 06:49:40,987 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-07 06:49:40,987 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:49:40,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-07 06:49:40,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-11-07 06:49:40,988 INFO L87 Difference]: Start difference. First operand 49 states and 53 transitions. Second operand 5 states. [2020-11-07 06:49:41,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:49:41,214 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-11-07 06:49:41,215 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-07 06:49:41,216 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 41 [2020-11-07 06:49:41,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:49:41,217 INFO L225 Difference]: With dead ends: 69 [2020-11-07 06:49:41,217 INFO L226 Difference]: Without dead ends: 52 [2020-11-07 06:49:41,218 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-11-07 06:49:41,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-11-07 06:49:41,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50. [2020-11-07 06:49:41,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-11-07 06:49:41,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2020-11-07 06:49:41,255 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 41 [2020-11-07 06:49:41,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:49:41,257 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2020-11-07 06:49:41,257 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-07 06:49:41,257 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2020-11-07 06:49:41,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-11-07 06:49:41,259 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:49:41,259 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:49:41,260 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-11-07 06:49:41,260 INFO L429 AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:49:41,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:49:41,260 INFO L82 PathProgramCache]: Analyzing trace with hash -713857982, now seen corresponding path program 1 times [2020-11-07 06:49:41,261 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:49:41,261 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [577243539] [2020-11-07 06:49:41,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:49:41,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:42,182 WARN L194 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 37 [2020-11-07 06:49:42,408 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:49:42,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:42,477 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:49:42,477 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [577243539] [2020-11-07 06:49:42,478 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:49:42,478 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-11-07 06:49:42,478 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567646139] [2020-11-07 06:49:42,478 INFO L461 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-11-07 06:49:42,479 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:49:42,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-11-07 06:49:42,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-11-07 06:49:42,480 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 20 states. [2020-11-07 06:49:43,531 WARN L194 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 60 [2020-11-07 06:49:43,715 WARN L194 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 67 [2020-11-07 06:49:43,932 WARN L194 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 72 DAG size of output: 68 [2020-11-07 06:49:44,102 WARN L194 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 65 DAG size of output: 61 [2020-11-07 06:49:44,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:49:44,522 INFO L93 Difference]: Finished difference Result 80 states and 93 transitions. [2020-11-07 06:49:44,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-11-07 06:49:44,522 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 41 [2020-11-07 06:49:44,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:49:44,524 INFO L225 Difference]: With dead ends: 80 [2020-11-07 06:49:44,524 INFO L226 Difference]: Without dead ends: 74 [2020-11-07 06:49:44,525 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 204 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=235, Invalid=887, Unknown=0, NotChecked=0, Total=1122 [2020-11-07 06:49:44,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-11-07 06:49:44,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 53. [2020-11-07 06:49:44,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-11-07 06:49:44,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 57 transitions. [2020-11-07 06:49:44,549 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 57 transitions. Word has length 41 [2020-11-07 06:49:44,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:49:44,550 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 57 transitions. [2020-11-07 06:49:44,550 INFO L482 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-11-07 06:49:44,550 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 57 transitions. [2020-11-07 06:49:44,551 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-11-07 06:49:44,551 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:49:44,551 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:49:44,551 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-11-07 06:49:44,551 INFO L429 AbstractCegarLoop]: === Iteration 9 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:49:44,552 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:49:44,552 INFO L82 PathProgramCache]: Analyzing trace with hash -674897316, now seen corresponding path program 2 times [2020-11-07 06:49:44,552 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:49:44,553 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [542202346] [2020-11-07 06:49:44,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:49:44,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:44,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:49:44,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:44,745 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:49:44,745 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [542202346] [2020-11-07 06:49:44,745 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:49:44,746 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-11-07 06:49:44,746 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200842250] [2020-11-07 06:49:44,746 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-07 06:49:44,747 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:49:44,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-07 06:49:44,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-07 06:49:44,748 INFO L87 Difference]: Start difference. First operand 53 states and 57 transitions. Second operand 6 states. [2020-11-07 06:49:45,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:49:45,155 INFO L93 Difference]: Finished difference Result 79 states and 91 transitions. [2020-11-07 06:49:45,156 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-07 06:49:45,156 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 45 [2020-11-07 06:49:45,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:49:45,157 INFO L225 Difference]: With dead ends: 79 [2020-11-07 06:49:45,157 INFO L226 Difference]: Without dead ends: 62 [2020-11-07 06:49:45,158 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-11-07 06:49:45,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-11-07 06:49:45,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 54. [2020-11-07 06:49:45,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-11-07 06:49:45,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2020-11-07 06:49:45,180 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 45 [2020-11-07 06:49:45,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:49:45,180 INFO L481 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2020-11-07 06:49:45,180 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-07 06:49:45,181 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2020-11-07 06:49:45,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-11-07 06:49:45,181 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:49:45,182 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:49:45,182 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-11-07 06:49:45,182 INFO L429 AbstractCegarLoop]: === Iteration 10 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:49:45,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:49:45,183 INFO L82 PathProgramCache]: Analyzing trace with hash -1786750291, now seen corresponding path program 1 times [2020-11-07 06:49:45,183 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:49:45,183 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [587818437] [2020-11-07 06:49:45,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:49:45,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:45,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:49:45,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:45,304 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:49:45,305 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [587818437] [2020-11-07 06:49:45,305 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:49:45,305 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-11-07 06:49:45,306 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320756400] [2020-11-07 06:49:45,306 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-07 06:49:45,306 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:49:45,307 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-07 06:49:45,307 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-07 06:49:45,307 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand 6 states. [2020-11-07 06:49:45,634 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:49:45,634 INFO L93 Difference]: Finished difference Result 78 states and 89 transitions. [2020-11-07 06:49:45,635 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-07 06:49:45,635 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 46 [2020-11-07 06:49:45,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:49:45,637 INFO L225 Difference]: With dead ends: 78 [2020-11-07 06:49:45,637 INFO L226 Difference]: Without dead ends: 61 [2020-11-07 06:49:45,638 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-11-07 06:49:45,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-11-07 06:49:45,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 55. [2020-11-07 06:49:45,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-11-07 06:49:45,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 59 transitions. [2020-11-07 06:49:45,671 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 59 transitions. Word has length 46 [2020-11-07 06:49:45,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:49:45,673 INFO L481 AbstractCegarLoop]: Abstraction has 55 states and 59 transitions. [2020-11-07 06:49:45,674 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-07 06:49:45,674 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 59 transitions. [2020-11-07 06:49:45,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-11-07 06:49:45,676 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:49:45,676 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:49:45,676 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-11-07 06:49:45,677 INFO L429 AbstractCegarLoop]: === Iteration 11 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:49:45,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:49:45,677 INFO L82 PathProgramCache]: Analyzing trace with hash -27526730, now seen corresponding path program 1 times [2020-11-07 06:49:45,678 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:49:45,679 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [704241830] [2020-11-07 06:49:45,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:49:45,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:46,111 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:49:46,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:46,180 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 5 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:49:46,180 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [704241830] [2020-11-07 06:49:46,181 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:49:46,181 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-11-07 06:49:46,181 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888462575] [2020-11-07 06:49:46,181 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-07 06:49:46,182 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:49:46,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-07 06:49:46,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=70, Unknown=0, NotChecked=0, Total=90 [2020-11-07 06:49:46,183 INFO L87 Difference]: Start difference. First operand 55 states and 59 transitions. Second operand 10 states. [2020-11-07 06:49:46,785 WARN L194 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-11-07 06:49:47,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:49:47,098 INFO L93 Difference]: Finished difference Result 77 states and 87 transitions. [2020-11-07 06:49:47,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-07 06:49:47,099 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 47 [2020-11-07 06:49:47,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:49:47,100 INFO L225 Difference]: With dead ends: 77 [2020-11-07 06:49:47,100 INFO L226 Difference]: Without dead ends: 60 [2020-11-07 06:49:47,102 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 2 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2020-11-07 06:49:47,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-11-07 06:49:47,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 56. [2020-11-07 06:49:47,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-11-07 06:49:47,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2020-11-07 06:49:47,133 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 47 [2020-11-07 06:49:47,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:49:47,133 INFO L481 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2020-11-07 06:49:47,133 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-07 06:49:47,133 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2020-11-07 06:49:47,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-11-07 06:49:47,139 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:49:47,139 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:49:47,139 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-11-07 06:49:47,139 INFO L429 AbstractCegarLoop]: === Iteration 12 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:49:47,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:49:47,140 INFO L82 PathProgramCache]: Analyzing trace with hash 540756231, now seen corresponding path program 1 times [2020-11-07 06:49:47,140 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:49:47,140 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1382494424] [2020-11-07 06:49:47,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:49:47,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:47,753 WARN L194 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 35 [2020-11-07 06:49:47,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:49:47,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:47,976 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:49:47,977 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1382494424] [2020-11-07 06:49:47,977 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:49:47,977 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-11-07 06:49:47,978 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715065478] [2020-11-07 06:49:47,978 INFO L461 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-11-07 06:49:47,978 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:49:47,979 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-11-07 06:49:47,979 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=266, Unknown=0, NotChecked=0, Total=342 [2020-11-07 06:49:47,979 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand 19 states. [2020-11-07 06:49:51,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:49:51,400 INFO L93 Difference]: Finished difference Result 88 states and 102 transitions. [2020-11-07 06:49:51,401 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-11-07 06:49:51,401 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 48 [2020-11-07 06:49:51,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:49:51,402 INFO L225 Difference]: With dead ends: 88 [2020-11-07 06:49:51,402 INFO L226 Difference]: Without dead ends: 82 [2020-11-07 06:49:51,405 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=215, Invalid=907, Unknown=0, NotChecked=0, Total=1122 [2020-11-07 06:49:51,405 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-11-07 06:49:51,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 61. [2020-11-07 06:49:51,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-11-07 06:49:51,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 66 transitions. [2020-11-07 06:49:51,435 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 66 transitions. Word has length 48 [2020-11-07 06:49:51,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:49:51,435 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 66 transitions. [2020-11-07 06:49:51,436 INFO L482 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-11-07 06:49:51,436 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 66 transitions. [2020-11-07 06:49:51,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-11-07 06:49:51,436 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:49:51,437 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:49:51,437 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-11-07 06:49:51,437 INFO L429 AbstractCegarLoop]: === Iteration 13 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:49:51,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:49:51,438 INFO L82 PathProgramCache]: Analyzing trace with hash -19669855, now seen corresponding path program 2 times [2020-11-07 06:49:51,438 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:49:51,438 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [490988107] [2020-11-07 06:49:51,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:49:51,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:52,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:49:52,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:52,074 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:49:52,075 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [490988107] [2020-11-07 06:49:52,075 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:49:52,075 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-11-07 06:49:52,075 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137434241] [2020-11-07 06:49:52,076 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-11-07 06:49:52,076 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:49:52,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-11-07 06:49:52,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=126, Unknown=0, NotChecked=0, Total=156 [2020-11-07 06:49:52,077 INFO L87 Difference]: Start difference. First operand 61 states and 66 transitions. Second operand 13 states. [2020-11-07 06:49:53,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:49:53,018 INFO L93 Difference]: Finished difference Result 89 states and 102 transitions. [2020-11-07 06:49:53,019 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-07 06:49:53,019 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 52 [2020-11-07 06:49:53,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:49:53,020 INFO L225 Difference]: With dead ends: 89 [2020-11-07 06:49:53,021 INFO L226 Difference]: Without dead ends: 69 [2020-11-07 06:49:53,022 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2020-11-07 06:49:53,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-11-07 06:49:53,061 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 61. [2020-11-07 06:49:53,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-11-07 06:49:53,062 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 65 transitions. [2020-11-07 06:49:53,063 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 65 transitions. Word has length 52 [2020-11-07 06:49:53,063 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:49:53,063 INFO L481 AbstractCegarLoop]: Abstraction has 61 states and 65 transitions. [2020-11-07 06:49:53,063 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-11-07 06:49:53,064 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 65 transitions. [2020-11-07 06:49:53,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-11-07 06:49:53,065 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:49:53,065 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:49:53,065 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-11-07 06:49:53,065 INFO L429 AbstractCegarLoop]: === Iteration 14 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:49:53,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:49:53,066 INFO L82 PathProgramCache]: Analyzing trace with hash 1345431816, now seen corresponding path program 1 times [2020-11-07 06:49:53,066 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:49:53,067 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [975547285] [2020-11-07 06:49:53,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:49:53,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:53,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:49:53,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:53,182 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 7 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:49:53,182 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [975547285] [2020-11-07 06:49:53,182 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:49:53,183 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-11-07 06:49:53,183 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1856856246] [2020-11-07 06:49:53,183 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-07 06:49:53,184 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:49:53,184 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-07 06:49:53,184 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-11-07 06:49:53,185 INFO L87 Difference]: Start difference. First operand 61 states and 65 transitions. Second operand 7 states. [2020-11-07 06:49:53,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:49:53,562 INFO L93 Difference]: Finished difference Result 82 states and 92 transitions. [2020-11-07 06:49:53,563 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-07 06:49:53,563 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 53 [2020-11-07 06:49:53,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:49:53,564 INFO L225 Difference]: With dead ends: 82 [2020-11-07 06:49:53,564 INFO L226 Difference]: Without dead ends: 65 [2020-11-07 06:49:53,565 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-11-07 06:49:53,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-11-07 06:49:53,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2020-11-07 06:49:53,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-11-07 06:49:53,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 67 transitions. [2020-11-07 06:49:53,597 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 67 transitions. Word has length 53 [2020-11-07 06:49:53,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:49:53,597 INFO L481 AbstractCegarLoop]: Abstraction has 63 states and 67 transitions. [2020-11-07 06:49:53,598 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-07 06:49:53,598 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 67 transitions. [2020-11-07 06:49:53,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-11-07 06:49:53,598 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:49:53,599 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:49:53,599 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-11-07 06:49:53,599 INFO L429 AbstractCegarLoop]: === Iteration 15 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:49:53,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:49:53,600 INFO L82 PathProgramCache]: Analyzing trace with hash -1714129221, now seen corresponding path program 1 times [2020-11-07 06:49:53,600 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:49:53,600 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1306170302] [2020-11-07 06:49:53,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:49:53,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:54,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:49:54,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:49:54,340 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:49:54,341 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1306170302] [2020-11-07 06:49:54,341 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:49:54,341 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-11-07 06:49:54,341 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895635085] [2020-11-07 06:49:54,342 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-11-07 06:49:54,342 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:49:54,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-11-07 06:49:54,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2020-11-07 06:49:54,343 INFO L87 Difference]: Start difference. First operand 63 states and 67 transitions. Second operand 21 states. [2020-11-07 06:49:59,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:49:59,951 INFO L93 Difference]: Finished difference Result 81 states and 89 transitions. [2020-11-07 06:49:59,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-11-07 06:49:59,952 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 54 [2020-11-07 06:49:59,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:49:59,953 INFO L225 Difference]: With dead ends: 81 [2020-11-07 06:49:59,953 INFO L226 Difference]: Without dead ends: 75 [2020-11-07 06:49:59,955 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 353 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=243, Invalid=1163, Unknown=0, NotChecked=0, Total=1406 [2020-11-07 06:49:59,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-11-07 06:49:59,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 66. [2020-11-07 06:49:59,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-11-07 06:49:59,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 70 transitions. [2020-11-07 06:49:59,986 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 70 transitions. Word has length 54 [2020-11-07 06:49:59,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:49:59,987 INFO L481 AbstractCegarLoop]: Abstraction has 66 states and 70 transitions. [2020-11-07 06:49:59,987 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-11-07 06:49:59,987 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 70 transitions. [2020-11-07 06:49:59,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-11-07 06:49:59,988 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:49:59,988 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:49:59,988 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-11-07 06:49:59,988 INFO L429 AbstractCegarLoop]: === Iteration 16 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:49:59,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:49:59,989 INFO L82 PathProgramCache]: Analyzing trace with hash -2013851563, now seen corresponding path program 2 times [2020-11-07 06:49:59,989 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:49:59,989 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [860996627] [2020-11-07 06:49:59,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:50:00,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:00,534 WARN L194 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 34 [2020-11-07 06:50:02,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:50:02,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:02,739 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 5 proven. 37 refuted. 1 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:50:02,740 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [860996627] [2020-11-07 06:50:02,742 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:50:02,743 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-11-07 06:50:02,743 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531159309] [2020-11-07 06:50:02,744 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-11-07 06:50:02,744 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:50:02,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-11-07 06:50:02,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=128, Unknown=1, NotChecked=0, Total=156 [2020-11-07 06:50:02,746 INFO L87 Difference]: Start difference. First operand 66 states and 70 transitions. Second operand 13 states. [2020-11-07 06:50:03,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:50:03,765 INFO L93 Difference]: Finished difference Result 87 states and 97 transitions. [2020-11-07 06:50:03,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-07 06:50:03,765 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 58 [2020-11-07 06:50:03,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:50:03,767 INFO L225 Difference]: With dead ends: 87 [2020-11-07 06:50:03,767 INFO L226 Difference]: Without dead ends: 70 [2020-11-07 06:50:03,768 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=77, Invalid=302, Unknown=1, NotChecked=0, Total=380 [2020-11-07 06:50:03,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-11-07 06:50:03,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 68. [2020-11-07 06:50:03,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-11-07 06:50:03,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 72 transitions. [2020-11-07 06:50:03,799 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 72 transitions. Word has length 58 [2020-11-07 06:50:03,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:50:03,799 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 72 transitions. [2020-11-07 06:50:03,799 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-11-07 06:50:03,799 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 72 transitions. [2020-11-07 06:50:03,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-11-07 06:50:03,800 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:50:03,800 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:50:03,800 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-11-07 06:50:03,801 INFO L429 AbstractCegarLoop]: === Iteration 17 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:50:03,801 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:50:03,801 INFO L82 PathProgramCache]: Analyzing trace with hash -344658988, now seen corresponding path program 1 times [2020-11-07 06:50:03,801 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:50:03,802 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [461615845] [2020-11-07 06:50:03,802 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:50:03,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:05,258 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:50:05,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:05,365 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:50:05,366 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [461615845] [2020-11-07 06:50:05,366 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:50:05,366 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-11-07 06:50:05,366 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101405758] [2020-11-07 06:50:05,368 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-11-07 06:50:05,368 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:50:05,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-11-07 06:50:05,374 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=562, Unknown=0, NotChecked=0, Total=650 [2020-11-07 06:50:05,374 INFO L87 Difference]: Start difference. First operand 68 states and 72 transitions. Second operand 26 states. [2020-11-07 06:50:06,431 WARN L194 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 52 [2020-11-07 06:50:06,593 WARN L194 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 58 [2020-11-07 06:50:06,831 WARN L194 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 59 [2020-11-07 06:50:07,338 WARN L194 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 57 [2020-11-07 06:50:08,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:50:08,292 INFO L93 Difference]: Finished difference Result 86 states and 94 transitions. [2020-11-07 06:50:08,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-11-07 06:50:08,293 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-11-07 06:50:08,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:50:08,294 INFO L225 Difference]: With dead ends: 86 [2020-11-07 06:50:08,294 INFO L226 Difference]: Without dead ends: 80 [2020-11-07 06:50:08,296 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=302, Invalid=1768, Unknown=0, NotChecked=0, Total=2070 [2020-11-07 06:50:08,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-11-07 06:50:08,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 71. [2020-11-07 06:50:08,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-11-07 06:50:08,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 75 transitions. [2020-11-07 06:50:08,328 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 75 transitions. Word has length 59 [2020-11-07 06:50:08,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:50:08,328 INFO L481 AbstractCegarLoop]: Abstraction has 71 states and 75 transitions. [2020-11-07 06:50:08,328 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-11-07 06:50:08,328 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 75 transitions. [2020-11-07 06:50:08,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-11-07 06:50:08,329 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:50:08,329 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:50:08,329 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-11-07 06:50:08,330 INFO L429 AbstractCegarLoop]: === Iteration 18 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:50:08,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:50:08,330 INFO L82 PathProgramCache]: Analyzing trace with hash 2075480302, now seen corresponding path program 2 times [2020-11-07 06:50:08,331 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:50:08,331 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1239476700] [2020-11-07 06:50:08,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:50:08,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:09,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:50:09,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:09,967 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 62 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:50:09,968 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1239476700] [2020-11-07 06:50:09,968 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:50:09,968 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-11-07 06:50:09,968 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759688581] [2020-11-07 06:50:09,969 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-11-07 06:50:09,969 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:50:09,969 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-11-07 06:50:09,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=662, Unknown=0, NotChecked=0, Total=756 [2020-11-07 06:50:09,970 INFO L87 Difference]: Start difference. First operand 71 states and 75 transitions. Second operand 28 states. [2020-11-07 06:50:11,232 WARN L194 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 58 [2020-11-07 06:50:11,520 WARN L194 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 59 [2020-11-07 06:50:19,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:50:19,490 INFO L93 Difference]: Finished difference Result 104 states and 118 transitions. [2020-11-07 06:50:19,490 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-11-07 06:50:19,491 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-11-07 06:50:19,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:50:19,492 INFO L225 Difference]: With dead ends: 104 [2020-11-07 06:50:19,492 INFO L226 Difference]: Without dead ends: 84 [2020-11-07 06:50:19,494 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 446 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=325, Invalid=2125, Unknown=0, NotChecked=0, Total=2450 [2020-11-07 06:50:19,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-11-07 06:50:19,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 75. [2020-11-07 06:50:19,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-11-07 06:50:19,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 79 transitions. [2020-11-07 06:50:19,531 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 79 transitions. Word has length 63 [2020-11-07 06:50:19,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:50:19,531 INFO L481 AbstractCegarLoop]: Abstraction has 75 states and 79 transitions. [2020-11-07 06:50:19,531 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-11-07 06:50:19,531 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 79 transitions. [2020-11-07 06:50:19,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-11-07 06:50:19,532 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:50:19,532 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:50:19,532 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-11-07 06:50:19,532 INFO L429 AbstractCegarLoop]: === Iteration 19 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:50:19,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:50:19,533 INFO L82 PathProgramCache]: Analyzing trace with hash 2091489544, now seen corresponding path program 3 times [2020-11-07 06:50:19,533 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:50:19,533 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1891207409] [2020-11-07 06:50:19,534 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:50:19,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:20,256 WARN L194 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 37 [2020-11-07 06:50:20,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:50:20,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:20,440 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 0 proven. 83 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:50:20,445 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1891207409] [2020-11-07 06:50:20,445 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:50:20,446 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-11-07 06:50:20,446 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1936323754] [2020-11-07 06:50:20,448 INFO L461 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-11-07 06:50:20,448 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:50:20,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-11-07 06:50:20,449 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=204, Unknown=0, NotChecked=0, Total=240 [2020-11-07 06:50:20,450 INFO L87 Difference]: Start difference. First operand 75 states and 79 transitions. Second operand 16 states. [2020-11-07 06:50:21,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:50:21,945 INFO L93 Difference]: Finished difference Result 101 states and 113 transitions. [2020-11-07 06:50:21,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-11-07 06:50:21,946 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 67 [2020-11-07 06:50:21,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:50:21,947 INFO L225 Difference]: With dead ends: 101 [2020-11-07 06:50:21,947 INFO L226 Difference]: Without dead ends: 84 [2020-11-07 06:50:21,948 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=100, Invalid=500, Unknown=0, NotChecked=0, Total=600 [2020-11-07 06:50:21,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-11-07 06:50:21,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 76. [2020-11-07 06:50:21,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-11-07 06:50:21,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 80 transitions. [2020-11-07 06:50:21,993 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 80 transitions. Word has length 67 [2020-11-07 06:50:21,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:50:21,994 INFO L481 AbstractCegarLoop]: Abstraction has 76 states and 80 transitions. [2020-11-07 06:50:21,994 INFO L482 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-11-07 06:50:21,994 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 80 transitions. [2020-11-07 06:50:21,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-11-07 06:50:21,995 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:50:21,995 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:50:21,995 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-11-07 06:50:21,995 INFO L429 AbstractCegarLoop]: === Iteration 20 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:50:21,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:50:21,996 INFO L82 PathProgramCache]: Analyzing trace with hash -1928103551, now seen corresponding path program 4 times [2020-11-07 06:50:21,996 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:50:21,996 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1438539373] [2020-11-07 06:50:21,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:50:22,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:22,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:50:22,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:22,178 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 14 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:50:22,178 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1438539373] [2020-11-07 06:50:22,179 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:50:22,179 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-11-07 06:50:22,179 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947091223] [2020-11-07 06:50:22,179 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-07 06:50:22,179 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:50:22,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-07 06:50:22,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=73, Unknown=0, NotChecked=0, Total=90 [2020-11-07 06:50:22,180 INFO L87 Difference]: Start difference. First operand 76 states and 80 transitions. Second operand 10 states. [2020-11-07 06:50:22,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:50:22,914 INFO L93 Difference]: Finished difference Result 100 states and 111 transitions. [2020-11-07 06:50:22,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-07 06:50:22,914 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 68 [2020-11-07 06:50:22,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:50:22,916 INFO L225 Difference]: With dead ends: 100 [2020-11-07 06:50:22,916 INFO L226 Difference]: Without dead ends: 83 [2020-11-07 06:50:22,917 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=227, Unknown=0, NotChecked=0, Total=272 [2020-11-07 06:50:22,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-11-07 06:50:22,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 77. [2020-11-07 06:50:22,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-11-07 06:50:22,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 81 transitions. [2020-11-07 06:50:22,953 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 81 transitions. Word has length 68 [2020-11-07 06:50:22,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:50:22,953 INFO L481 AbstractCegarLoop]: Abstraction has 77 states and 81 transitions. [2020-11-07 06:50:22,954 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-07 06:50:22,954 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 81 transitions. [2020-11-07 06:50:22,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-11-07 06:50:22,954 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:50:22,954 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:50:22,955 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-11-07 06:50:22,955 INFO L429 AbstractCegarLoop]: === Iteration 21 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:50:22,955 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:50:22,955 INFO L82 PathProgramCache]: Analyzing trace with hash -114510494, now seen corresponding path program 5 times [2020-11-07 06:50:22,955 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:50:22,956 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [915309965] [2020-11-07 06:50:22,956 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:50:22,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:24,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:50:24,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:24,952 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 0 proven. 89 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:50:24,952 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [915309965] [2020-11-07 06:50:24,952 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:50:24,952 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-11-07 06:50:24,953 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469001018] [2020-11-07 06:50:24,953 INFO L461 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-11-07 06:50:24,953 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:50:24,954 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-11-07 06:50:24,954 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=100, Invalid=770, Unknown=0, NotChecked=0, Total=870 [2020-11-07 06:50:24,954 INFO L87 Difference]: Start difference. First operand 77 states and 81 transitions. Second operand 30 states. [2020-11-07 06:50:26,098 WARN L194 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 52 [2020-11-07 06:50:26,282 WARN L194 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 58 [2020-11-07 06:50:26,704 WARN L194 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 52 [2020-11-07 06:50:27,109 WARN L194 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 57 [2020-11-07 06:50:28,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:50:28,693 INFO L93 Difference]: Finished difference Result 110 states and 124 transitions. [2020-11-07 06:50:28,694 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-11-07 06:50:28,694 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 69 [2020-11-07 06:50:28,694 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:50:28,695 INFO L225 Difference]: With dead ends: 110 [2020-11-07 06:50:28,695 INFO L226 Difference]: Without dead ends: 90 [2020-11-07 06:50:28,697 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 516 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=348, Invalid=2514, Unknown=0, NotChecked=0, Total=2862 [2020-11-07 06:50:28,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-11-07 06:50:28,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 81. [2020-11-07 06:50:28,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-11-07 06:50:28,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 85 transitions. [2020-11-07 06:50:28,738 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 85 transitions. Word has length 69 [2020-11-07 06:50:28,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:50:28,738 INFO L481 AbstractCegarLoop]: Abstraction has 81 states and 85 transitions. [2020-11-07 06:50:28,738 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-11-07 06:50:28,738 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 85 transitions. [2020-11-07 06:50:28,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-11-07 06:50:28,739 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:50:28,739 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 5, 4, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:50:28,739 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-11-07 06:50:28,740 INFO L429 AbstractCegarLoop]: === Iteration 22 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:50:28,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:50:28,740 INFO L82 PathProgramCache]: Analyzing trace with hash -298736772, now seen corresponding path program 6 times [2020-11-07 06:50:28,740 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:50:28,741 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1451497026] [2020-11-07 06:50:28,741 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:50:28,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:29,625 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:50:29,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:29,705 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 0 proven. 113 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:50:29,705 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1451497026] [2020-11-07 06:50:29,706 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:50:29,706 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-11-07 06:50:29,706 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720152908] [2020-11-07 06:50:29,706 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-11-07 06:50:29,706 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:50:29,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-11-07 06:50:29,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=234, Unknown=0, NotChecked=0, Total=272 [2020-11-07 06:50:29,707 INFO L87 Difference]: Start difference. First operand 81 states and 85 transitions. Second operand 17 states. [2020-11-07 06:50:31,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:50:31,569 INFO L93 Difference]: Finished difference Result 107 states and 119 transitions. [2020-11-07 06:50:31,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-11-07 06:50:31,577 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 73 [2020-11-07 06:50:31,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:50:31,578 INFO L225 Difference]: With dead ends: 107 [2020-11-07 06:50:31,578 INFO L226 Difference]: Without dead ends: 90 [2020-11-07 06:50:31,579 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=109, Invalid=593, Unknown=0, NotChecked=0, Total=702 [2020-11-07 06:50:31,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-11-07 06:50:31,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 82. [2020-11-07 06:50:31,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-11-07 06:50:31,624 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 86 transitions. [2020-11-07 06:50:31,624 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 86 transitions. Word has length 73 [2020-11-07 06:50:31,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:50:31,624 INFO L481 AbstractCegarLoop]: Abstraction has 82 states and 86 transitions. [2020-11-07 06:50:31,624 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-11-07 06:50:31,624 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 86 transitions. [2020-11-07 06:50:31,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-11-07 06:50:31,625 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:50:31,625 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 6, 4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:50:31,625 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-11-07 06:50:31,625 INFO L429 AbstractCegarLoop]: === Iteration 23 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:50:31,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:50:31,626 INFO L82 PathProgramCache]: Analyzing trace with hash 1284291981, now seen corresponding path program 7 times [2020-11-07 06:50:31,626 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:50:31,626 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2091198823] [2020-11-07 06:50:31,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:50:31,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:31,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:50:31,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:31,854 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 16 proven. 101 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:50:31,855 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2091198823] [2020-11-07 06:50:31,855 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:50:31,855 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-11-07 06:50:31,857 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082866245] [2020-11-07 06:50:31,857 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-11-07 06:50:31,857 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:50:31,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-11-07 06:50:31,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-11-07 06:50:31,858 INFO L87 Difference]: Start difference. First operand 82 states and 86 transitions. Second operand 11 states. [2020-11-07 06:50:32,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:50:32,701 INFO L93 Difference]: Finished difference Result 104 states and 115 transitions. [2020-11-07 06:50:32,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-07 06:50:32,702 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 74 [2020-11-07 06:50:32,702 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:50:32,703 INFO L225 Difference]: With dead ends: 104 [2020-11-07 06:50:32,703 INFO L226 Difference]: Without dead ends: 87 [2020-11-07 06:50:32,704 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=51, Invalid=291, Unknown=0, NotChecked=0, Total=342 [2020-11-07 06:50:32,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-11-07 06:50:32,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 85. [2020-11-07 06:50:32,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-11-07 06:50:32,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 89 transitions. [2020-11-07 06:50:32,747 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 89 transitions. Word has length 74 [2020-11-07 06:50:32,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:50:32,747 INFO L481 AbstractCegarLoop]: Abstraction has 85 states and 89 transitions. [2020-11-07 06:50:32,747 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-11-07 06:50:32,748 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 89 transitions. [2020-11-07 06:50:32,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-11-07 06:50:32,748 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:50:32,748 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 6, 5, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:50:32,748 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-11-07 06:50:32,748 INFO L429 AbstractCegarLoop]: === Iteration 24 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:50:32,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:50:32,749 INFO L82 PathProgramCache]: Analyzing trace with hash 975914887, now seen corresponding path program 8 times [2020-11-07 06:50:32,749 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:50:32,749 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [928615669] [2020-11-07 06:50:32,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:50:32,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:35,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:50:35,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:35,199 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 0 proven. 123 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:50:35,200 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [928615669] [2020-11-07 06:50:35,200 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:50:35,200 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-11-07 06:50:35,200 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [286604975] [2020-11-07 06:50:35,201 INFO L461 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-11-07 06:50:35,201 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:50:35,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-11-07 06:50:35,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=886, Unknown=0, NotChecked=0, Total=992 [2020-11-07 06:50:35,203 INFO L87 Difference]: Start difference. First operand 85 states and 89 transitions. Second operand 32 states. [2020-11-07 06:50:36,426 WARN L194 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 52 [2020-11-07 06:50:36,622 WARN L194 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 58 [2020-11-07 06:50:36,937 WARN L194 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 59 [2020-11-07 06:50:37,106 WARN L194 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 52 [2020-11-07 06:50:37,556 WARN L194 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 57 [2020-11-07 06:50:39,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:50:39,626 INFO L93 Difference]: Finished difference Result 103 states and 111 transitions. [2020-11-07 06:50:39,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-11-07 06:50:39,628 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 76 [2020-11-07 06:50:39,628 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:50:39,629 INFO L225 Difference]: With dead ends: 103 [2020-11-07 06:50:39,629 INFO L226 Difference]: Without dead ends: 97 [2020-11-07 06:50:39,631 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 590 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=371, Invalid=2935, Unknown=0, NotChecked=0, Total=3306 [2020-11-07 06:50:39,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-11-07 06:50:39,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 88. [2020-11-07 06:50:39,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-11-07 06:50:39,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 92 transitions. [2020-11-07 06:50:39,677 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 92 transitions. Word has length 76 [2020-11-07 06:50:39,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:50:39,678 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 92 transitions. [2020-11-07 06:50:39,678 INFO L482 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-11-07 06:50:39,678 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 92 transitions. [2020-11-07 06:50:39,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-11-07 06:50:39,678 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:50:39,679 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 6, 5, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:50:39,679 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-11-07 06:50:39,679 INFO L429 AbstractCegarLoop]: === Iteration 25 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:50:39,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:50:39,679 INFO L82 PathProgramCache]: Analyzing trace with hash -1952408799, now seen corresponding path program 9 times [2020-11-07 06:50:39,680 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:50:39,680 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [264165824] [2020-11-07 06:50:39,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:50:39,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:40,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:50:40,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:40,804 INFO L134 CoverageAnalysis]: Checked inductivity of 150 backedges. 0 proven. 150 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:50:40,804 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [264165824] [2020-11-07 06:50:40,805 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:50:40,805 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-11-07 06:50:40,805 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83517298] [2020-11-07 06:50:40,805 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-11-07 06:50:40,805 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:50:40,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-11-07 06:50:40,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=266, Unknown=0, NotChecked=0, Total=306 [2020-11-07 06:50:40,806 INFO L87 Difference]: Start difference. First operand 88 states and 92 transitions. Second operand 18 states. [2020-11-07 06:50:43,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:50:43,000 INFO L93 Difference]: Finished difference Result 114 states and 126 transitions. [2020-11-07 06:50:43,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-11-07 06:50:43,002 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 80 [2020-11-07 06:50:43,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:50:43,003 INFO L225 Difference]: With dead ends: 114 [2020-11-07 06:50:43,003 INFO L226 Difference]: Without dead ends: 97 [2020-11-07 06:50:43,004 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=118, Invalid=694, Unknown=0, NotChecked=0, Total=812 [2020-11-07 06:50:43,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-11-07 06:50:43,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 89. [2020-11-07 06:50:43,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-11-07 06:50:43,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 93 transitions. [2020-11-07 06:50:43,065 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 93 transitions. Word has length 80 [2020-11-07 06:50:43,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:50:43,065 INFO L481 AbstractCegarLoop]: Abstraction has 89 states and 93 transitions. [2020-11-07 06:50:43,065 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-11-07 06:50:43,065 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 93 transitions. [2020-11-07 06:50:43,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-11-07 06:50:43,066 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:50:43,066 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:50:43,066 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-11-07 06:50:43,066 INFO L429 AbstractCegarLoop]: === Iteration 26 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:50:43,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:50:43,067 INFO L82 PathProgramCache]: Analyzing trace with hash 1560066696, now seen corresponding path program 10 times [2020-11-07 06:50:43,067 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:50:43,067 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1949368881] [2020-11-07 06:50:43,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:50:43,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:44,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:50:44,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:44,602 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:50:44,602 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1949368881] [2020-11-07 06:50:44,603 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:50:44,603 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-11-07 06:50:44,603 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1153317089] [2020-11-07 06:50:44,603 INFO L461 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-11-07 06:50:44,604 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:50:44,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-11-07 06:50:44,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=824, Unknown=0, NotChecked=0, Total=930 [2020-11-07 06:50:44,605 INFO L87 Difference]: Start difference. First operand 89 states and 93 transitions. Second operand 31 states. [2020-11-07 06:50:47,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:50:47,773 INFO L93 Difference]: Finished difference Result 113 states and 124 transitions. [2020-11-07 06:50:47,773 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-11-07 06:50:47,773 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 81 [2020-11-07 06:50:47,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:50:47,774 INFO L225 Difference]: With dead ends: 113 [2020-11-07 06:50:47,775 INFO L226 Difference]: Without dead ends: 107 [2020-11-07 06:50:47,776 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 772 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=301, Invalid=3005, Unknown=0, NotChecked=0, Total=3306 [2020-11-07 06:50:47,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-11-07 06:50:47,834 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 98. [2020-11-07 06:50:47,835 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2020-11-07 06:50:47,835 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 105 transitions. [2020-11-07 06:50:47,835 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 105 transitions. Word has length 81 [2020-11-07 06:50:47,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:50:47,836 INFO L481 AbstractCegarLoop]: Abstraction has 98 states and 105 transitions. [2020-11-07 06:50:47,836 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-11-07 06:50:47,836 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 105 transitions. [2020-11-07 06:50:47,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-11-07 06:50:47,836 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:50:47,837 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 5, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:50:47,837 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-11-07 06:50:47,837 INFO L429 AbstractCegarLoop]: === Iteration 27 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:50:47,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:50:47,837 INFO L82 PathProgramCache]: Analyzing trace with hash 848209314, now seen corresponding path program 11 times [2020-11-07 06:50:47,838 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:50:47,838 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1244673704] [2020-11-07 06:50:47,838 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:50:47,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:50,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:50:50,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:50,930 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 11 proven. 173 refuted. 1 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:50:50,931 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1244673704] [2020-11-07 06:50:50,931 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:50:50,931 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-11-07 06:50:50,931 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607819236] [2020-11-07 06:50:50,931 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-11-07 06:50:50,931 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:50:50,932 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-11-07 06:50:50,932 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=268, Unknown=1, NotChecked=0, Total=306 [2020-11-07 06:50:50,932 INFO L87 Difference]: Start difference. First operand 98 states and 105 transitions. Second operand 18 states. [2020-11-07 06:50:53,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:50:53,206 INFO L93 Difference]: Finished difference Result 122 states and 136 transitions. [2020-11-07 06:50:53,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-11-07 06:50:53,208 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 85 [2020-11-07 06:50:53,208 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:50:53,209 INFO L225 Difference]: With dead ends: 122 [2020-11-07 06:50:53,209 INFO L226 Difference]: Without dead ends: 98 [2020-11-07 06:50:53,210 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=122, Invalid=747, Unknown=1, NotChecked=0, Total=870 [2020-11-07 06:50:53,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-11-07 06:50:53,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 96. [2020-11-07 06:50:53,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-11-07 06:50:53,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 100 transitions. [2020-11-07 06:50:53,262 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 100 transitions. Word has length 85 [2020-11-07 06:50:53,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:50:53,262 INFO L481 AbstractCegarLoop]: Abstraction has 96 states and 100 transitions. [2020-11-07 06:50:53,262 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-11-07 06:50:53,263 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 100 transitions. [2020-11-07 06:50:53,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-11-07 06:50:53,263 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:50:53,263 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 8, 6, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:50:53,264 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-11-07 06:50:53,264 INFO L429 AbstractCegarLoop]: === Iteration 28 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:50:53,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:50:53,264 INFO L82 PathProgramCache]: Analyzing trace with hash -905903236, now seen corresponding path program 12 times [2020-11-07 06:50:53,264 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:50:53,265 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1899563271] [2020-11-07 06:50:53,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:50:53,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:56,328 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:50:56,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:50:56,503 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 0 proven. 197 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:50:56,503 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1899563271] [2020-11-07 06:50:56,503 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:50:56,504 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-11-07 06:50:56,504 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855969991] [2020-11-07 06:50:56,504 INFO L461 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-11-07 06:50:56,504 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:50:56,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-11-07 06:50:56,506 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=1142, Unknown=0, NotChecked=0, Total=1260 [2020-11-07 06:50:56,506 INFO L87 Difference]: Start difference. First operand 96 states and 100 transitions. Second operand 36 states. [2020-11-07 06:50:57,656 WARN L194 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 50 [2020-11-07 06:50:57,983 WARN L194 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 52 [2020-11-07 06:50:58,197 WARN L194 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 58 [2020-11-07 06:50:58,552 WARN L194 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 59 [2020-11-07 06:50:58,751 WARN L194 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 52 [2020-11-07 06:50:59,075 WARN L194 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 54 [2020-11-07 06:50:59,286 WARN L194 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 57 [2020-11-07 06:51:02,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:51:02,606 INFO L93 Difference]: Finished difference Result 114 states and 122 transitions. [2020-11-07 06:51:02,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-11-07 06:51:02,607 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 87 [2020-11-07 06:51:02,607 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:51:02,608 INFO L225 Difference]: With dead ends: 114 [2020-11-07 06:51:02,608 INFO L226 Difference]: Without dead ends: 108 [2020-11-07 06:51:02,610 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 750 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=417, Invalid=3873, Unknown=0, NotChecked=0, Total=4290 [2020-11-07 06:51:02,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-11-07 06:51:02,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 99. [2020-11-07 06:51:02,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-11-07 06:51:02,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 103 transitions. [2020-11-07 06:51:02,660 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 103 transitions. Word has length 87 [2020-11-07 06:51:02,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:51:02,661 INFO L481 AbstractCegarLoop]: Abstraction has 99 states and 103 transitions. [2020-11-07 06:51:02,661 INFO L482 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-11-07 06:51:02,661 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 103 transitions. [2020-11-07 06:51:02,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-11-07 06:51:02,661 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:51:02,661 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 8, 6, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:51:02,662 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-11-07 06:51:02,662 INFO L429 AbstractCegarLoop]: === Iteration 29 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:51:02,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:51:02,662 INFO L82 PathProgramCache]: Analyzing trace with hash -2120395626, now seen corresponding path program 13 times [2020-11-07 06:51:02,662 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:51:02,662 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1646705104] [2020-11-07 06:51:02,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:51:02,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:51:06,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:51:06,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:51:06,450 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 230 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:51:06,451 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1646705104] [2020-11-07 06:51:06,451 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:51:06,451 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-11-07 06:51:06,451 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601160716] [2020-11-07 06:51:06,452 INFO L461 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-11-07 06:51:06,452 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:51:06,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-11-07 06:51:06,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=124, Invalid=1282, Unknown=0, NotChecked=0, Total=1406 [2020-11-07 06:51:06,453 INFO L87 Difference]: Start difference. First operand 99 states and 103 transitions. Second operand 38 states. [2020-11-07 06:51:07,877 WARN L194 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 52 [2020-11-07 06:51:08,098 WARN L194 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 58 [2020-11-07 06:51:08,461 WARN L194 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 59 [2020-11-07 06:51:08,653 WARN L194 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 52 [2020-11-07 06:51:09,213 WARN L194 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 57 [2020-11-07 06:51:13,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:51:13,083 INFO L93 Difference]: Finished difference Result 132 states and 146 transitions. [2020-11-07 06:51:13,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-11-07 06:51:13,084 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 91 [2020-11-07 06:51:13,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:51:13,086 INFO L225 Difference]: With dead ends: 132 [2020-11-07 06:51:13,086 INFO L226 Difference]: Without dead ends: 112 [2020-11-07 06:51:13,090 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 836 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=440, Invalid=4390, Unknown=0, NotChecked=0, Total=4830 [2020-11-07 06:51:13,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-11-07 06:51:13,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 103. [2020-11-07 06:51:13,156 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-11-07 06:51:13,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 107 transitions. [2020-11-07 06:51:13,158 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 107 transitions. Word has length 91 [2020-11-07 06:51:13,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:51:13,158 INFO L481 AbstractCegarLoop]: Abstraction has 103 states and 107 transitions. [2020-11-07 06:51:13,158 INFO L482 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-11-07 06:51:13,158 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 107 transitions. [2020-11-07 06:51:13,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2020-11-07 06:51:13,159 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:51:13,159 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 8, 6, 4, 4, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:51:13,159 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-11-07 06:51:13,159 INFO L429 AbstractCegarLoop]: === Iteration 30 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:51:13,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:51:13,160 INFO L82 PathProgramCache]: Analyzing trace with hash -2112386896, now seen corresponding path program 14 times [2020-11-07 06:51:13,160 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:51:13,160 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1751364418] [2020-11-07 06:51:13,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:51:13,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:51:14,677 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:51:14,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:51:14,793 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 0 proven. 267 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:51:14,793 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1751364418] [2020-11-07 06:51:14,794 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:51:14,794 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-11-07 06:51:14,794 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301958579] [2020-11-07 06:51:14,794 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-11-07 06:51:14,794 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:51:14,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-11-07 06:51:14,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=374, Unknown=0, NotChecked=0, Total=420 [2020-11-07 06:51:14,795 INFO L87 Difference]: Start difference. First operand 103 states and 107 transitions. Second operand 21 states. [2020-11-07 06:51:18,398 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:51:18,398 INFO L93 Difference]: Finished difference Result 129 states and 141 transitions. [2020-11-07 06:51:18,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-11-07 06:51:18,400 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 95 [2020-11-07 06:51:18,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:51:18,401 INFO L225 Difference]: With dead ends: 129 [2020-11-07 06:51:18,401 INFO L226 Difference]: Without dead ends: 112 [2020-11-07 06:51:18,402 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=145, Invalid=1045, Unknown=0, NotChecked=0, Total=1190 [2020-11-07 06:51:18,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-11-07 06:51:18,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 104. [2020-11-07 06:51:18,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2020-11-07 06:51:18,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 108 transitions. [2020-11-07 06:51:18,452 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 108 transitions. Word has length 95 [2020-11-07 06:51:18,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:51:18,453 INFO L481 AbstractCegarLoop]: Abstraction has 104 states and 108 transitions. [2020-11-07 06:51:18,453 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-11-07 06:51:18,453 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 108 transitions. [2020-11-07 06:51:18,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-11-07 06:51:18,453 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:51:18,454 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 9, 6, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:51:18,454 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-11-07 06:51:18,454 INFO L429 AbstractCegarLoop]: === Iteration 31 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:51:18,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:51:18,454 INFO L82 PathProgramCache]: Analyzing trace with hash 895712985, now seen corresponding path program 15 times [2020-11-07 06:51:18,454 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:51:18,454 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [548162877] [2020-11-07 06:51:18,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:51:18,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:51:18,881 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:51:18,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:51:18,907 INFO L134 CoverageAnalysis]: Checked inductivity of 274 backedges. 25 proven. 249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:51:18,907 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [548162877] [2020-11-07 06:51:18,908 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:51:18,908 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-11-07 06:51:18,908 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089431626] [2020-11-07 06:51:18,908 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-11-07 06:51:18,909 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:51:18,909 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-11-07 06:51:18,909 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-11-07 06:51:18,909 INFO L87 Difference]: Start difference. First operand 104 states and 108 transitions. Second operand 15 states. [2020-11-07 06:51:20,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:51:20,677 INFO L93 Difference]: Finished difference Result 126 states and 137 transitions. [2020-11-07 06:51:20,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-11-07 06:51:20,678 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 96 [2020-11-07 06:51:20,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:51:20,680 INFO L225 Difference]: With dead ends: 126 [2020-11-07 06:51:20,680 INFO L226 Difference]: Without dead ends: 109 [2020-11-07 06:51:20,681 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=75, Invalid=627, Unknown=0, NotChecked=0, Total=702 [2020-11-07 06:51:20,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2020-11-07 06:51:20,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 107. [2020-11-07 06:51:20,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-11-07 06:51:20,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 111 transitions. [2020-11-07 06:51:20,761 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 111 transitions. Word has length 96 [2020-11-07 06:51:20,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:51:20,762 INFO L481 AbstractCegarLoop]: Abstraction has 107 states and 111 transitions. [2020-11-07 06:51:20,762 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-11-07 06:51:20,762 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 111 transitions. [2020-11-07 06:51:20,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-11-07 06:51:20,763 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:51:20,763 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 9, 7, 4, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:51:20,763 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-11-07 06:51:20,763 INFO L429 AbstractCegarLoop]: === Iteration 32 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:51:20,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:51:20,764 INFO L82 PathProgramCache]: Analyzing trace with hash 1213654483, now seen corresponding path program 16 times [2020-11-07 06:51:20,764 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:51:20,764 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [138813666] [2020-11-07 06:51:20,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:51:20,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:51:24,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:51:24,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:51:24,931 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 0 proven. 283 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:51:24,931 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [138813666] [2020-11-07 06:51:24,932 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:51:24,932 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-11-07 06:51:24,933 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591013462] [2020-11-07 06:51:24,933 INFO L461 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-11-07 06:51:24,934 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:51:24,935 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-11-07 06:51:24,936 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=1430, Unknown=0, NotChecked=0, Total=1560 [2020-11-07 06:51:24,936 INFO L87 Difference]: Start difference. First operand 107 states and 111 transitions. Second operand 40 states. [2020-11-07 06:51:25,922 WARN L194 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-11-07 06:51:26,117 WARN L194 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 48 [2020-11-07 06:51:26,296 WARN L194 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 50 [2020-11-07 06:51:26,633 WARN L194 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 52 [2020-11-07 06:51:26,890 WARN L194 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 58 [2020-11-07 06:51:27,335 WARN L194 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 59 [2020-11-07 06:51:27,561 WARN L194 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 52 [2020-11-07 06:51:27,932 WARN L194 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 54 [2020-11-07 06:51:28,194 WARN L194 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 57 [2020-11-07 06:51:32,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:51:32,907 INFO L93 Difference]: Finished difference Result 125 states and 133 transitions. [2020-11-07 06:51:32,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-11-07 06:51:32,910 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 98 [2020-11-07 06:51:32,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:51:32,911 INFO L225 Difference]: With dead ends: 125 [2020-11-07 06:51:32,911 INFO L226 Difference]: Without dead ends: 119 [2020-11-07 06:51:32,913 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 926 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=463, Invalid=4939, Unknown=0, NotChecked=0, Total=5402 [2020-11-07 06:51:32,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2020-11-07 06:51:32,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 110. [2020-11-07 06:51:32,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-11-07 06:51:32,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 114 transitions. [2020-11-07 06:51:32,985 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 114 transitions. Word has length 98 [2020-11-07 06:51:32,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:51:32,985 INFO L481 AbstractCegarLoop]: Abstraction has 110 states and 114 transitions. [2020-11-07 06:51:32,985 INFO L482 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-11-07 06:51:32,985 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 114 transitions. [2020-11-07 06:51:32,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-11-07 06:51:32,986 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:51:32,986 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 9, 7, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:51:32,987 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-11-07 06:51:32,987 INFO L429 AbstractCegarLoop]: === Iteration 33 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:51:32,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:51:32,987 INFO L82 PathProgramCache]: Analyzing trace with hash 1123824493, now seen corresponding path program 17 times [2020-11-07 06:51:32,988 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:51:32,988 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [531943760] [2020-11-07 06:51:32,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:51:33,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:51:34,077 WARN L194 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 34 [2020-11-07 06:51:35,052 WARN L194 SmtUtils]: Spent 786.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 37 [2020-11-07 06:51:35,239 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:51:35,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:51:35,363 INFO L134 CoverageAnalysis]: Checked inductivity of 323 backedges. 0 proven. 323 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:51:35,364 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [531943760] [2020-11-07 06:51:35,364 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:51:35,364 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-11-07 06:51:35,364 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505887965] [2020-11-07 06:51:35,365 INFO L461 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-11-07 06:51:35,365 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:51:35,365 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-11-07 06:51:35,365 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=414, Unknown=0, NotChecked=0, Total=462 [2020-11-07 06:51:35,365 INFO L87 Difference]: Start difference. First operand 110 states and 114 transitions. Second operand 22 states. [2020-11-07 06:51:39,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:51:39,865 INFO L93 Difference]: Finished difference Result 136 states and 148 transitions. [2020-11-07 06:51:39,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-11-07 06:51:39,867 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 102 [2020-11-07 06:51:39,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:51:39,868 INFO L225 Difference]: With dead ends: 136 [2020-11-07 06:51:39,869 INFO L226 Difference]: Without dead ends: 119 [2020-11-07 06:51:39,869 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=154, Invalid=1178, Unknown=0, NotChecked=0, Total=1332 [2020-11-07 06:51:39,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2020-11-07 06:51:39,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 111. [2020-11-07 06:51:39,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-11-07 06:51:39,933 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 115 transitions. [2020-11-07 06:51:39,933 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 115 transitions. Word has length 102 [2020-11-07 06:51:39,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:51:39,934 INFO L481 AbstractCegarLoop]: Abstraction has 111 states and 115 transitions. [2020-11-07 06:51:39,934 INFO L482 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-11-07 06:51:39,934 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 115 transitions. [2020-11-07 06:51:39,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-11-07 06:51:39,935 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:51:39,935 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 7, 4, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:51:39,935 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-11-07 06:51:39,935 INFO L429 AbstractCegarLoop]: === Iteration 34 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:51:39,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:51:39,936 INFO L82 PathProgramCache]: Analyzing trace with hash -1860949060, now seen corresponding path program 18 times [2020-11-07 06:51:39,936 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:51:39,936 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1074627703] [2020-11-07 06:51:39,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:51:40,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:51:42,673 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:51:42,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:51:42,717 INFO L134 CoverageAnalysis]: Checked inductivity of 331 backedges. 0 proven. 331 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:51:42,718 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1074627703] [2020-11-07 06:51:42,718 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:51:42,718 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-11-07 06:51:42,718 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [827744050] [2020-11-07 06:51:42,719 INFO L461 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-11-07 06:51:42,719 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:51:42,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-11-07 06:51:42,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=1352, Unknown=0, NotChecked=0, Total=1482 [2020-11-07 06:51:42,720 INFO L87 Difference]: Start difference. First operand 111 states and 115 transitions. Second operand 39 states. [2020-11-07 06:51:49,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:51:49,220 INFO L93 Difference]: Finished difference Result 135 states and 146 transitions. [2020-11-07 06:51:49,222 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-11-07 06:51:49,222 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 103 [2020-11-07 06:51:49,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:51:49,223 INFO L225 Difference]: With dead ends: 135 [2020-11-07 06:51:49,224 INFO L226 Difference]: Without dead ends: 129 [2020-11-07 06:51:49,227 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1196 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=369, Invalid=5033, Unknown=0, NotChecked=0, Total=5402 [2020-11-07 06:51:49,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2020-11-07 06:51:49,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 120. [2020-11-07 06:51:49,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-11-07 06:51:49,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 127 transitions. [2020-11-07 06:51:49,296 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 127 transitions. Word has length 103 [2020-11-07 06:51:49,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:51:49,296 INFO L481 AbstractCegarLoop]: Abstraction has 120 states and 127 transitions. [2020-11-07 06:51:49,297 INFO L482 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-11-07 06:51:49,297 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 127 transitions. [2020-11-07 06:51:49,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-11-07 06:51:49,297 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:51:49,298 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 10, 7, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:51:49,298 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-11-07 06:51:49,298 INFO L429 AbstractCegarLoop]: === Iteration 35 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:51:49,298 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:51:49,298 INFO L82 PathProgramCache]: Analyzing trace with hash -1100849962, now seen corresponding path program 19 times [2020-11-07 06:51:49,299 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:51:49,299 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [772199053] [2020-11-07 06:51:49,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:51:49,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:51:50,897 WARN L194 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 37 [2020-11-07 06:51:51,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:51:51,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:51:51,252 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 374 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:51:51,252 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [772199053] [2020-11-07 06:51:51,252 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:51:51,252 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-11-07 06:51:51,252 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951867867] [2020-11-07 06:51:51,253 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-11-07 06:51:51,253 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:51:51,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-11-07 06:51:51,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=456, Unknown=0, NotChecked=0, Total=506 [2020-11-07 06:51:51,254 INFO L87 Difference]: Start difference. First operand 120 states and 127 transitions. Second operand 23 states. [2020-11-07 06:51:55,801 WARN L194 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-11-07 06:51:56,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:51:56,521 INFO L93 Difference]: Finished difference Result 146 states and 161 transitions. [2020-11-07 06:51:56,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-11-07 06:51:56,524 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 107 [2020-11-07 06:51:56,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:51:56,525 INFO L225 Difference]: With dead ends: 146 [2020-11-07 06:51:56,525 INFO L226 Difference]: Without dead ends: 122 [2020-11-07 06:51:56,526 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 177 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=163, Invalid=1319, Unknown=0, NotChecked=0, Total=1482 [2020-11-07 06:51:56,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-11-07 06:51:56,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 118. [2020-11-07 06:51:56,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2020-11-07 06:51:56,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 122 transitions. [2020-11-07 06:51:56,600 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 122 transitions. Word has length 107 [2020-11-07 06:51:56,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:51:56,601 INFO L481 AbstractCegarLoop]: Abstraction has 118 states and 122 transitions. [2020-11-07 06:51:56,601 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-11-07 06:51:56,601 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 122 transitions. [2020-11-07 06:51:56,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-11-07 06:51:56,602 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:51:56,602 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 11, 8, 5, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:51:56,602 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-11-07 06:51:56,602 INFO L429 AbstractCegarLoop]: === Iteration 36 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:51:56,607 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:51:56,607 INFO L82 PathProgramCache]: Analyzing trace with hash -1681128371, now seen corresponding path program 20 times [2020-11-07 06:51:56,607 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:51:56,607 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [793060300] [2020-11-07 06:51:56,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:51:56,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:51:57,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:51:57,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:51:57,165 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 28 proven. 365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:51:57,165 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [793060300] [2020-11-07 06:51:57,165 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:51:57,165 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-11-07 06:51:57,165 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571259268] [2020-11-07 06:51:57,166 INFO L461 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-11-07 06:51:57,166 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:51:57,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-11-07 06:51:57,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-11-07 06:51:57,166 INFO L87 Difference]: Start difference. First operand 118 states and 122 transitions. Second operand 17 states. [2020-11-07 06:51:59,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:51:59,721 INFO L93 Difference]: Finished difference Result 138 states and 147 transitions. [2020-11-07 06:51:59,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-11-07 06:51:59,724 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 110 [2020-11-07 06:51:59,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:51:59,725 INFO L225 Difference]: With dead ends: 138 [2020-11-07 06:51:59,725 INFO L226 Difference]: Without dead ends: 121 [2020-11-07 06:51:59,726 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=87, Invalid=843, Unknown=0, NotChecked=0, Total=930 [2020-11-07 06:51:59,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2020-11-07 06:51:59,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 119. [2020-11-07 06:51:59,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2020-11-07 06:51:59,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 123 transitions. [2020-11-07 06:51:59,840 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 123 transitions. Word has length 110 [2020-11-07 06:51:59,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:51:59,840 INFO L481 AbstractCegarLoop]: Abstraction has 119 states and 123 transitions. [2020-11-07 06:51:59,840 INFO L482 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-11-07 06:51:59,840 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 123 transitions. [2020-11-07 06:51:59,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-11-07 06:51:59,841 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:51:59,842 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 11, 8, 5, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:51:59,842 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-11-07 06:51:59,842 INFO L429 AbstractCegarLoop]: === Iteration 37 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:51:59,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:51:59,842 INFO L82 PathProgramCache]: Analyzing trace with hash -1875060755, now seen corresponding path program 21 times [2020-11-07 06:51:59,843 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:51:59,843 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1348052834] [2020-11-07 06:51:59,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:51:59,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:52:05,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:52:05,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:52:05,469 INFO L134 CoverageAnalysis]: Checked inductivity of 395 backedges. 0 proven. 395 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:52:05,470 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1348052834] [2020-11-07 06:52:05,470 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:52:05,470 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-11-07 06:52:05,470 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119856445] [2020-11-07 06:52:05,471 INFO L461 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-11-07 06:52:05,471 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:52:05,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-11-07 06:52:05,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=1750, Unknown=0, NotChecked=0, Total=1892 [2020-11-07 06:52:05,472 INFO L87 Difference]: Start difference. First operand 119 states and 123 transitions. Second operand 44 states. [2020-11-07 06:52:06,353 WARN L194 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 44 [2020-11-07 06:52:06,600 WARN L194 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-11-07 06:52:06,847 WARN L194 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 48 [2020-11-07 06:52:07,081 WARN L194 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 50 [2020-11-07 06:52:07,537 WARN L194 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 52 [2020-11-07 06:52:07,887 WARN L194 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 58 [2020-11-07 06:52:08,540 WARN L194 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 59 [2020-11-07 06:52:08,833 WARN L194 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 52 [2020-11-07 06:52:09,390 WARN L194 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 54 [2020-11-07 06:52:09,698 WARN L194 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 57 [2020-11-07 06:52:17,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:52:17,552 INFO L93 Difference]: Finished difference Result 137 states and 145 transitions. [2020-11-07 06:52:17,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-11-07 06:52:17,553 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 110 [2020-11-07 06:52:17,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:52:17,555 INFO L225 Difference]: With dead ends: 137 [2020-11-07 06:52:17,555 INFO L226 Difference]: Without dead ends: 131 [2020-11-07 06:52:17,556 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1118 ImplicationChecksByTransitivity, 11.9s TimeCoverageRelationStatistics Valid=509, Invalid=6133, Unknown=0, NotChecked=0, Total=6642 [2020-11-07 06:52:17,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2020-11-07 06:52:17,636 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 122. [2020-11-07 06:52:17,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2020-11-07 06:52:17,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 126 transitions. [2020-11-07 06:52:17,637 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 126 transitions. Word has length 110 [2020-11-07 06:52:17,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:52:17,638 INFO L481 AbstractCegarLoop]: Abstraction has 122 states and 126 transitions. [2020-11-07 06:52:17,638 INFO L482 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-11-07 06:52:17,638 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 126 transitions. [2020-11-07 06:52:17,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-11-07 06:52:17,639 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:52:17,639 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 11, 8, 5, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:52:17,639 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-11-07 06:52:17,639 INFO L429 AbstractCegarLoop]: === Iteration 38 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:52:17,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:52:17,640 INFO L82 PathProgramCache]: Analyzing trace with hash 1678215303, now seen corresponding path program 22 times [2020-11-07 06:52:17,640 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:52:17,640 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [766868674] [2020-11-07 06:52:17,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:52:17,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:52:19,125 WARN L194 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 21 [2020-11-07 06:52:23,491 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:52:23,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:52:23,642 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 17 proven. 422 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:52:23,643 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [766868674] [2020-11-07 06:52:23,643 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:52:23,643 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-11-07 06:52:23,643 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908355257] [2020-11-07 06:52:23,643 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-11-07 06:52:23,644 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:52:23,644 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-11-07 06:52:23,644 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=457, Unknown=2, NotChecked=0, Total=506 [2020-11-07 06:52:23,644 INFO L87 Difference]: Start difference. First operand 122 states and 126 transitions. Second operand 23 states. [2020-11-07 06:52:29,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:52:29,810 INFO L93 Difference]: Finished difference Result 145 states and 157 transitions. [2020-11-07 06:52:29,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-11-07 06:52:29,811 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 114 [2020-11-07 06:52:29,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:52:29,813 INFO L225 Difference]: With dead ends: 145 [2020-11-07 06:52:29,813 INFO L226 Difference]: Without dead ends: 128 [2020-11-07 06:52:29,814 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 172 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=167, Invalid=1391, Unknown=2, NotChecked=0, Total=1560 [2020-11-07 06:52:29,815 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-11-07 06:52:29,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 126. [2020-11-07 06:52:29,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 126 states. [2020-11-07 06:52:29,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 126 states to 126 states and 130 transitions. [2020-11-07 06:52:29,897 INFO L78 Accepts]: Start accepts. Automaton has 126 states and 130 transitions. Word has length 114 [2020-11-07 06:52:29,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:52:29,898 INFO L481 AbstractCegarLoop]: Abstraction has 126 states and 130 transitions. [2020-11-07 06:52:29,898 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-11-07 06:52:29,898 INFO L276 IsEmpty]: Start isEmpty. Operand 126 states and 130 transitions. [2020-11-07 06:52:29,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-11-07 06:52:29,898 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:52:29,898 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 9, 6, 4, 4, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:52:29,899 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-11-07 06:52:29,899 INFO L429 AbstractCegarLoop]: === Iteration 39 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:52:29,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:52:29,899 INFO L82 PathProgramCache]: Analyzing trace with hash -337416452, now seen corresponding path program 23 times [2020-11-07 06:52:29,899 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:52:29,899 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1105749142] [2020-11-07 06:52:29,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:52:29,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:52:35,951 WARN L194 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 32 [2020-11-07 06:52:36,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:52:36,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:52:37,037 INFO L134 CoverageAnalysis]: Checked inductivity of 463 backedges. 0 proven. 463 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:52:37,037 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1105749142] [2020-11-07 06:52:37,037 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:52:37,037 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-11-07 06:52:37,037 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585755321] [2020-11-07 06:52:37,038 INFO L461 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-11-07 06:52:37,038 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:52:37,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-11-07 06:52:37,039 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=1922, Unknown=0, NotChecked=0, Total=2070 [2020-11-07 06:52:37,039 INFO L87 Difference]: Start difference. First operand 126 states and 130 transitions. Second operand 46 states. [2020-11-07 06:52:37,877 WARN L194 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 44 [2020-11-07 06:52:38,109 WARN L194 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-11-07 06:52:38,341 WARN L194 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 48 [2020-11-07 06:52:38,569 WARN L194 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 50 [2020-11-07 06:52:39,098 WARN L194 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 52 [2020-11-07 06:52:39,476 WARN L194 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 58 [2020-11-07 06:52:40,210 WARN L194 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 59 [2020-11-07 06:52:40,507 WARN L194 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 52 [2020-11-07 06:52:41,100 WARN L194 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 54 [2020-11-07 06:52:41,478 WARN L194 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 57 [2020-11-07 06:52:49,203 WARN L194 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-11-07 06:52:51,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:52:51,070 INFO L93 Difference]: Finished difference Result 144 states and 152 transitions. [2020-11-07 06:52:51,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-11-07 06:52:51,073 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 117 [2020-11-07 06:52:51,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:52:51,074 INFO L225 Difference]: With dead ends: 144 [2020-11-07 06:52:51,075 INFO L226 Difference]: Without dead ends: 138 [2020-11-07 06:52:51,076 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1220 ImplicationChecksByTransitivity, 14.4s TimeCoverageRelationStatistics Valid=532, Invalid=6778, Unknown=0, NotChecked=0, Total=7310 [2020-11-07 06:52:51,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2020-11-07 06:52:51,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 129. [2020-11-07 06:52:51,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-11-07 06:52:51,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 133 transitions. [2020-11-07 06:52:51,207 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 133 transitions. Word has length 117 [2020-11-07 06:52:51,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:52:51,208 INFO L481 AbstractCegarLoop]: Abstraction has 129 states and 133 transitions. [2020-11-07 06:52:51,208 INFO L482 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-11-07 06:52:51,208 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 133 transitions. [2020-11-07 06:52:51,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-11-07 06:52:51,209 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:52:51,209 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 12, 9, 6, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:52:51,209 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-11-07 06:52:51,209 INFO L429 AbstractCegarLoop]: === Iteration 40 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:52:51,210 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:52:51,210 INFO L82 PathProgramCache]: Analyzing trace with hash -849477610, now seen corresponding path program 24 times [2020-11-07 06:52:51,210 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:52:51,210 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [221959405] [2020-11-07 06:52:51,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:52:51,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:52:52,132 WARN L194 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-11-07 06:52:58,134 WARN L194 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 32 [2020-11-07 06:52:59,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:52:59,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:52:59,522 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 0 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:52:59,522 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [221959405] [2020-11-07 06:52:59,522 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:52:59,522 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-11-07 06:52:59,523 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723139272] [2020-11-07 06:52:59,523 INFO L461 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-11-07 06:52:59,523 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:52:59,523 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-11-07 06:52:59,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=2102, Unknown=0, NotChecked=0, Total=2256 [2020-11-07 06:52:59,524 INFO L87 Difference]: Start difference. First operand 129 states and 133 transitions. Second operand 48 states. [2020-11-07 06:53:00,067 WARN L194 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 40 [2020-11-07 06:53:00,387 WARN L194 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 42 [2020-11-07 06:53:00,691 WARN L194 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 44 [2020-11-07 06:53:01,014 WARN L194 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-11-07 06:53:01,325 WARN L194 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 48 [2020-11-07 06:53:01,606 WARN L194 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 50 [2020-11-07 06:53:02,242 WARN L194 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 52 [2020-11-07 06:53:02,708 WARN L194 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 58 [2020-11-07 06:53:03,630 WARN L194 SmtUtils]: Spent 195.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 59 [2020-11-07 06:53:04,003 WARN L194 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 52 [2020-11-07 06:53:04,800 WARN L194 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 54 [2020-11-07 06:53:05,272 WARN L194 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 57 [2020-11-07 06:53:07,562 WARN L194 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:53:13,893 WARN L194 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:53:16,327 WARN L194 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-11-07 06:53:18,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:53:18,001 INFO L93 Difference]: Finished difference Result 162 states and 176 transitions. [2020-11-07 06:53:18,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-11-07 06:53:18,004 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 121 [2020-11-07 06:53:18,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:53:18,006 INFO L225 Difference]: With dead ends: 162 [2020-11-07 06:53:18,006 INFO L226 Difference]: Without dead ends: 142 [2020-11-07 06:53:18,007 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1326 ImplicationChecksByTransitivity, 17.1s TimeCoverageRelationStatistics Valid=555, Invalid=7455, Unknown=0, NotChecked=0, Total=8010 [2020-11-07 06:53:18,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2020-11-07 06:53:18,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 133. [2020-11-07 06:53:18,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2020-11-07 06:53:18,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 137 transitions. [2020-11-07 06:53:18,127 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 137 transitions. Word has length 121 [2020-11-07 06:53:18,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:53:18,127 INFO L481 AbstractCegarLoop]: Abstraction has 133 states and 137 transitions. [2020-11-07 06:53:18,127 INFO L482 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-11-07 06:53:18,128 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 137 transitions. [2020-11-07 06:53:18,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 126 [2020-11-07 06:53:18,128 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:53:18,129 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 9, 6, 5, 5, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:53:18,129 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-11-07 06:53:18,129 INFO L429 AbstractCegarLoop]: === Iteration 41 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:53:18,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:53:18,129 INFO L82 PathProgramCache]: Analyzing trace with hash 1586918448, now seen corresponding path program 25 times [2020-11-07 06:53:18,129 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:53:18,130 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1294489226] [2020-11-07 06:53:18,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:53:18,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:53:20,151 WARN L194 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 34 [2020-11-07 06:53:20,641 WARN L194 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 37 [2020-11-07 06:53:20,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:53:20,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:53:21,205 INFO L134 CoverageAnalysis]: Checked inductivity of 565 backedges. 0 proven. 565 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:53:21,205 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1294489226] [2020-11-07 06:53:21,205 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:53:21,205 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-11-07 06:53:21,206 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [981761321] [2020-11-07 06:53:21,206 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-11-07 06:53:21,206 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:53:21,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-11-07 06:53:21,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=594, Unknown=0, NotChecked=0, Total=650 [2020-11-07 06:53:21,207 INFO L87 Difference]: Start difference. First operand 133 states and 137 transitions. Second operand 26 states. [2020-11-07 06:53:29,170 WARN L194 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-11-07 06:53:29,606 WARN L194 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-11-07 06:53:30,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:53:30,873 INFO L93 Difference]: Finished difference Result 159 states and 171 transitions. [2020-11-07 06:53:30,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-11-07 06:53:30,875 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 125 [2020-11-07 06:53:30,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:53:30,877 INFO L225 Difference]: With dead ends: 159 [2020-11-07 06:53:30,877 INFO L226 Difference]: Without dead ends: 142 [2020-11-07 06:53:30,878 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 237 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=190, Invalid=1790, Unknown=0, NotChecked=0, Total=1980 [2020-11-07 06:53:30,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2020-11-07 06:53:30,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 134. [2020-11-07 06:53:30,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 134 states. [2020-11-07 06:53:30,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 138 transitions. [2020-11-07 06:53:30,983 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 138 transitions. Word has length 125 [2020-11-07 06:53:30,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:53:30,983 INFO L481 AbstractCegarLoop]: Abstraction has 134 states and 138 transitions. [2020-11-07 06:53:30,984 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-11-07 06:53:30,984 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 138 transitions. [2020-11-07 06:53:30,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-11-07 06:53:30,984 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:53:30,984 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 13, 9, 6, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:53:30,985 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-11-07 06:53:30,985 INFO L429 AbstractCegarLoop]: === Iteration 42 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:53:30,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:53:30,985 INFO L82 PathProgramCache]: Analyzing trace with hash -389938343, now seen corresponding path program 26 times [2020-11-07 06:53:30,985 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:53:30,985 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1684058274] [2020-11-07 06:53:30,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:53:31,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:53:31,845 WARN L194 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-11-07 06:53:39,164 WARN L194 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 32 [2020-11-07 06:53:40,306 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:53:40,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:53:40,596 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:53:40,596 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1684058274] [2020-11-07 06:53:40,597 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:53:40,597 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-11-07 06:53:40,597 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [256544143] [2020-11-07 06:53:40,597 INFO L461 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-11-07 06:53:40,597 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:53:40,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-11-07 06:53:40,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=2290, Unknown=0, NotChecked=0, Total=2450 [2020-11-07 06:53:40,598 INFO L87 Difference]: Start difference. First operand 134 states and 138 transitions. Second operand 50 states. [2020-11-07 06:53:41,172 WARN L194 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 40 [2020-11-07 06:53:41,470 WARN L194 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 42 [2020-11-07 06:53:41,780 WARN L194 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 44 [2020-11-07 06:53:42,134 WARN L194 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-11-07 06:53:42,486 WARN L194 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 48 [2020-11-07 06:53:42,794 WARN L194 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 50 [2020-11-07 06:53:43,460 WARN L194 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 52 [2020-11-07 06:53:43,918 WARN L194 SmtUtils]: Spent 203.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 58 [2020-11-07 06:53:44,911 WARN L194 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 59 [2020-11-07 06:53:45,295 WARN L194 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 52 [2020-11-07 06:53:46,198 WARN L194 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 54 [2020-11-07 06:53:46,745 WARN L194 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 57 [2020-11-07 06:53:49,675 WARN L194 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:54:00,001 WARN L194 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-11-07 06:54:01,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:54:01,184 INFO L93 Difference]: Finished difference Result 167 states and 181 transitions. [2020-11-07 06:54:01,186 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-11-07 06:54:01,186 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 126 [2020-11-07 06:54:01,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:54:01,188 INFO L225 Difference]: With dead ends: 167 [2020-11-07 06:54:01,188 INFO L226 Difference]: Without dead ends: 147 [2020-11-07 06:54:01,189 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1436 ImplicationChecksByTransitivity, 19.2s TimeCoverageRelationStatistics Valid=578, Invalid=8164, Unknown=0, NotChecked=0, Total=8742 [2020-11-07 06:54:01,190 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2020-11-07 06:54:01,286 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 138. [2020-11-07 06:54:01,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 138 states. [2020-11-07 06:54:01,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 138 states to 138 states and 142 transitions. [2020-11-07 06:54:01,287 INFO L78 Accepts]: Start accepts. Automaton has 138 states and 142 transitions. Word has length 126 [2020-11-07 06:54:01,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:54:01,287 INFO L481 AbstractCegarLoop]: Abstraction has 138 states and 142 transitions. [2020-11-07 06:54:01,287 INFO L482 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-11-07 06:54:01,287 INFO L276 IsEmpty]: Start isEmpty. Operand 138 states and 142 transitions. [2020-11-07 06:54:01,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2020-11-07 06:54:01,288 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:54:01,288 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 9, 6, 5, 5, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:54:01,288 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-11-07 06:54:01,288 INFO L429 AbstractCegarLoop]: === Iteration 43 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:54:01,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:54:01,289 INFO L82 PathProgramCache]: Analyzing trace with hash 1441865203, now seen corresponding path program 27 times [2020-11-07 06:54:01,289 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:54:01,289 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2010057743] [2020-11-07 06:54:01,289 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:54:01,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:54:03,568 WARN L194 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 34 [2020-11-07 06:54:04,219 WARN L194 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 37 [2020-11-07 06:54:04,545 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:54:04,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:54:04,760 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 0 proven. 632 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:54:04,760 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2010057743] [2020-11-07 06:54:04,760 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:54:04,760 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-11-07 06:54:04,761 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1465043566] [2020-11-07 06:54:04,761 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-11-07 06:54:04,761 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:54:04,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-11-07 06:54:04,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=644, Unknown=0, NotChecked=0, Total=702 [2020-11-07 06:54:04,762 INFO L87 Difference]: Start difference. First operand 138 states and 142 transitions. Second operand 27 states. [2020-11-07 06:54:05,281 WARN L194 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 40 [2020-11-07 06:54:11,431 WARN L194 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:54:13,675 WARN L194 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-11-07 06:54:14,056 WARN L194 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-11-07 06:54:15,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:54:15,411 INFO L93 Difference]: Finished difference Result 163 states and 175 transitions. [2020-11-07 06:54:15,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-11-07 06:54:15,414 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 130 [2020-11-07 06:54:15,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:54:15,416 INFO L225 Difference]: With dead ends: 163 [2020-11-07 06:54:15,416 INFO L226 Difference]: Without dead ends: 146 [2020-11-07 06:54:15,416 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 259 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=199, Invalid=1963, Unknown=0, NotChecked=0, Total=2162 [2020-11-07 06:54:15,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2020-11-07 06:54:15,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 140. [2020-11-07 06:54:15,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-11-07 06:54:15,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 144 transitions. [2020-11-07 06:54:15,505 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 144 transitions. Word has length 130 [2020-11-07 06:54:15,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:54:15,505 INFO L481 AbstractCegarLoop]: Abstraction has 140 states and 144 transitions. [2020-11-07 06:54:15,505 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-11-07 06:54:15,505 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 144 transitions. [2020-11-07 06:54:15,506 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2020-11-07 06:54:15,506 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:54:15,507 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 14, 10, 6, 4, 4, 4, 4, 4, 4, 4, 4, 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, 1, 1] [2020-11-07 06:54:15,507 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-11-07 06:54:15,507 INFO L429 AbstractCegarLoop]: === Iteration 44 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:54:15,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:54:15,507 INFO L82 PathProgramCache]: Analyzing trace with hash -1633244275, now seen corresponding path program 28 times [2020-11-07 06:54:15,507 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:54:15,508 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [467580055] [2020-11-07 06:54:15,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:54:15,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:54:18,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:54:18,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:54:19,109 INFO L134 CoverageAnalysis]: Checked inductivity of 653 backedges. 38 proven. 615 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:54:19,110 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [467580055] [2020-11-07 06:54:19,110 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:54:19,110 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-11-07 06:54:19,110 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1355350618] [2020-11-07 06:54:19,110 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-11-07 06:54:19,110 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:54:19,111 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-11-07 06:54:19,111 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=550, Unknown=0, NotChecked=0, Total=600 [2020-11-07 06:54:19,111 INFO L87 Difference]: Start difference. First operand 140 states and 144 transitions. Second operand 25 states. [2020-11-07 06:54:19,625 WARN L194 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 40 [2020-11-07 06:54:20,154 WARN L194 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-11-07 06:54:22,332 WARN L194 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:54:24,939 WARN L194 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:54:27,518 WARN L194 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:54:28,927 WARN L194 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:54:30,933 WARN L194 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-11-07 06:54:31,389 WARN L194 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-11-07 06:54:33,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:54:33,518 INFO L93 Difference]: Finished difference Result 162 states and 172 transitions. [2020-11-07 06:54:33,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-11-07 06:54:33,520 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 132 [2020-11-07 06:54:33,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:54:33,522 INFO L225 Difference]: With dead ends: 162 [2020-11-07 06:54:33,523 INFO L226 Difference]: Without dead ends: 145 [2020-11-07 06:54:33,523 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 2 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 210 ImplicationChecksByTransitivity, 7.7s TimeCoverageRelationStatistics Valid=191, Invalid=1789, Unknown=0, NotChecked=0, Total=1980 [2020-11-07 06:54:33,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 145 states. [2020-11-07 06:54:33,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 145 to 141. [2020-11-07 06:54:33,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 141 states. [2020-11-07 06:54:33,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 145 transitions. [2020-11-07 06:54:33,614 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 145 transitions. Word has length 132 [2020-11-07 06:54:33,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:54:33,614 INFO L481 AbstractCegarLoop]: Abstraction has 141 states and 145 transitions. [2020-11-07 06:54:33,614 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-11-07 06:54:33,614 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 145 transitions. [2020-11-07 06:54:33,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-11-07 06:54:33,615 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:54:33,615 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 14, 10, 7, 4, 4, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:54:33,616 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-11-07 06:54:33,616 INFO L429 AbstractCegarLoop]: === Iteration 45 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:54:33,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:54:33,616 INFO L82 PathProgramCache]: Analyzing trace with hash -1991847408, now seen corresponding path program 29 times [2020-11-07 06:54:33,616 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:54:33,617 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [166502826] [2020-11-07 06:54:33,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:54:33,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:54:34,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:54:34,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:54:34,619 INFO L134 CoverageAnalysis]: Checked inductivity of 658 backedges. 37 proven. 621 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:54:34,619 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [166502826] [2020-11-07 06:54:34,619 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:54:34,619 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-11-07 06:54:34,619 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390625307] [2020-11-07 06:54:34,620 INFO L461 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-11-07 06:54:34,620 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:54:34,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-11-07 06:54:34,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-11-07 06:54:34,620 INFO L87 Difference]: Start difference. First operand 141 states and 145 transitions. Second operand 21 states. [2020-11-07 06:54:40,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:54:40,563 INFO L93 Difference]: Finished difference Result 161 states and 170 transitions. [2020-11-07 06:54:40,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-11-07 06:54:40,566 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 133 [2020-11-07 06:54:40,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:54:40,568 INFO L225 Difference]: With dead ends: 161 [2020-11-07 06:54:40,568 INFO L226 Difference]: Without dead ends: 144 [2020-11-07 06:54:40,569 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=111, Invalid=1371, Unknown=0, NotChecked=0, Total=1482 [2020-11-07 06:54:40,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2020-11-07 06:54:40,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 142. [2020-11-07 06:54:40,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-11-07 06:54:40,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 146 transitions. [2020-11-07 06:54:40,681 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 146 transitions. Word has length 133 [2020-11-07 06:54:40,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:54:40,681 INFO L481 AbstractCegarLoop]: Abstraction has 142 states and 146 transitions. [2020-11-07 06:54:40,681 INFO L482 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-11-07 06:54:40,681 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 146 transitions. [2020-11-07 06:54:40,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-11-07 06:54:40,682 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:54:40,682 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 14, 10, 7, 5, 5, 4, 4, 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, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:54:40,682 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-11-07 06:54:40,682 INFO L429 AbstractCegarLoop]: === Iteration 46 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:54:40,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:54:40,682 INFO L82 PathProgramCache]: Analyzing trace with hash 2109187504, now seen corresponding path program 30 times [2020-11-07 06:54:40,683 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:54:40,683 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [68790226] [2020-11-07 06:54:40,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:54:40,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:54:48,277 WARN L194 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-11-07 06:54:49,803 WARN L194 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 32 [2020-11-07 06:54:50,391 WARN L194 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 22 [2020-11-07 06:54:51,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:54:51,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:54:51,386 INFO L134 CoverageAnalysis]: Checked inductivity of 660 backedges. 0 proven. 660 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:54:51,387 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [68790226] [2020-11-07 06:54:51,387 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:54:51,387 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2020-11-07 06:54:51,387 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1046021057] [2020-11-07 06:54:51,388 INFO L461 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-11-07 06:54:51,388 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:54:51,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-11-07 06:54:51,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=2486, Unknown=0, NotChecked=0, Total=2652 [2020-11-07 06:54:51,389 INFO L87 Difference]: Start difference. First operand 142 states and 146 transitions. Second operand 52 states. [2020-11-07 06:54:52,031 WARN L194 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 40 [2020-11-07 06:54:52,361 WARN L194 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 42 [2020-11-07 06:54:52,706 WARN L194 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 44 [2020-11-07 06:54:53,068 WARN L194 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-11-07 06:54:53,423 WARN L194 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 48 [2020-11-07 06:54:53,727 WARN L194 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 50 [2020-11-07 06:54:54,508 WARN L194 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 52 [2020-11-07 06:54:55,029 WARN L194 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 58 [2020-11-07 06:54:56,256 WARN L194 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 59 [2020-11-07 06:54:56,711 WARN L194 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 52 [2020-11-07 06:54:57,680 WARN L194 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 54 [2020-11-07 06:54:58,203 WARN L194 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 57 [2020-11-07 06:55:00,302 WARN L194 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:55:00,999 WARN L194 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:55:01,442 WARN L194 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:55:03,378 WARN L194 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:55:04,826 WARN L194 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:55:06,465 WARN L194 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:55:06,885 WARN L194 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:55:09,174 WARN L194 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:55:11,665 WARN L194 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:55:13,641 WARN L194 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:55:14,143 WARN L194 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-11-07 06:55:15,228 WARN L194 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-11-07 06:55:15,768 WARN L194 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-11-07 06:55:16,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:55:16,676 INFO L93 Difference]: Finished difference Result 160 states and 168 transitions. [2020-11-07 06:55:16,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-11-07 06:55:16,679 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 133 [2020-11-07 06:55:16,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:55:16,681 INFO L225 Difference]: With dead ends: 160 [2020-11-07 06:55:16,681 INFO L226 Difference]: Without dead ends: 154 [2020-11-07 06:55:16,682 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1550 ImplicationChecksByTransitivity, 22.3s TimeCoverageRelationStatistics Valid=601, Invalid=8905, Unknown=0, NotChecked=0, Total=9506 [2020-11-07 06:55:16,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 154 states. [2020-11-07 06:55:16,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 154 to 145. [2020-11-07 06:55:16,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2020-11-07 06:55:16,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 149 transitions. [2020-11-07 06:55:16,777 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 149 transitions. Word has length 133 [2020-11-07 06:55:16,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:55:16,778 INFO L481 AbstractCegarLoop]: Abstraction has 145 states and 149 transitions. [2020-11-07 06:55:16,778 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-11-07 06:55:16,778 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 149 transitions. [2020-11-07 06:55:16,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 138 [2020-11-07 06:55:16,778 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:55:16,779 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 14, 10, 7, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 06:55:16,779 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-11-07 06:55:16,779 INFO L429 AbstractCegarLoop]: === Iteration 47 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:55:16,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:55:16,779 INFO L82 PathProgramCache]: Analyzing trace with hash 1477426378, now seen corresponding path program 31 times [2020-11-07 06:55:16,779 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:55:16,779 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [485836751] [2020-11-07 06:55:16,780 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:55:16,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:55:19,029 WARN L194 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 30 [2020-11-07 06:55:19,557 WARN L194 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 34 [2020-11-07 06:55:20,305 WARN L194 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 37 [2020-11-07 06:55:20,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:55:20,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:55:21,004 INFO L134 CoverageAnalysis]: Checked inductivity of 719 backedges. 0 proven. 719 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:55:21,004 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [485836751] [2020-11-07 06:55:21,005 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:55:21,005 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-11-07 06:55:21,005 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1011716731] [2020-11-07 06:55:21,005 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-11-07 06:55:21,005 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:55:21,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-11-07 06:55:21,006 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=696, Unknown=0, NotChecked=0, Total=756 [2020-11-07 06:55:21,006 INFO L87 Difference]: Start difference. First operand 145 states and 149 transitions. Second operand 28 states. [2020-11-07 06:55:21,647 WARN L194 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 40 [2020-11-07 06:55:23,613 WARN L194 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:55:28,162 WARN L194 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:55:29,455 WARN L194 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:55:32,901 WARN L194 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-11-07 06:55:33,387 WARN L194 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-11-07 06:55:35,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:55:35,061 INFO L93 Difference]: Finished difference Result 170 states and 182 transitions. [2020-11-07 06:55:35,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-11-07 06:55:35,065 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 137 [2020-11-07 06:55:35,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:55:35,066 INFO L225 Difference]: With dead ends: 170 [2020-11-07 06:55:35,066 INFO L226 Difference]: Without dead ends: 153 [2020-11-07 06:55:35,067 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 282 ImplicationChecksByTransitivity, 7.9s TimeCoverageRelationStatistics Valid=208, Invalid=2144, Unknown=0, NotChecked=0, Total=2352 [2020-11-07 06:55:35,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2020-11-07 06:55:35,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 147. [2020-11-07 06:55:35,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2020-11-07 06:55:35,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 151 transitions. [2020-11-07 06:55:35,163 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 151 transitions. Word has length 137 [2020-11-07 06:55:35,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:55:35,164 INFO L481 AbstractCegarLoop]: Abstraction has 147 states and 151 transitions. [2020-11-07 06:55:35,164 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-11-07 06:55:35,164 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 151 transitions. [2020-11-07 06:55:35,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2020-11-07 06:55:35,164 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:55:35,164 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 15, 11, 7, 5, 5, 4, 4, 4, 4, 4, 4, 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, 1, 1] [2020-11-07 06:55:35,165 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-11-07 06:55:35,165 INFO L429 AbstractCegarLoop]: === Iteration 48 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:55:35,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:55:35,165 INFO L82 PathProgramCache]: Analyzing trace with hash -1818693468, now seen corresponding path program 32 times [2020-11-07 06:55:35,165 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:55:35,165 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1415673998] [2020-11-07 06:55:35,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:55:35,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:55:40,990 WARN L194 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 32 [2020-11-07 06:55:41,535 WARN L194 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 23 [2020-11-07 06:55:42,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:55:42,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:55:42,239 INFO L134 CoverageAnalysis]: Checked inductivity of 742 backedges. 0 proven. 742 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:55:42,239 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1415673998] [2020-11-07 06:55:42,239 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:55:42,240 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-11-07 06:55:42,240 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609227694] [2020-11-07 06:55:42,240 INFO L461 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-11-07 06:55:42,240 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:55:42,240 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-11-07 06:55:42,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=2384, Unknown=0, NotChecked=0, Total=2550 [2020-11-07 06:55:42,241 INFO L87 Difference]: Start difference. First operand 147 states and 151 transitions. Second operand 51 states. [2020-11-07 06:55:59,790 WARN L194 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-11-07 06:56:00,491 WARN L194 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-11-07 06:56:02,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:56:02,343 INFO L93 Difference]: Finished difference Result 169 states and 179 transitions. [2020-11-07 06:56:02,347 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-11-07 06:56:02,347 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 139 [2020-11-07 06:56:02,348 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:56:02,349 INFO L225 Difference]: With dead ends: 169 [2020-11-07 06:56:02,349 INFO L226 Difference]: Without dead ends: 163 [2020-11-07 06:56:02,350 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1952 ImplicationChecksByTransitivity, 14.7s TimeCoverageRelationStatistics Valid=471, Invalid=9035, Unknown=0, NotChecked=0, Total=9506 [2020-11-07 06:56:02,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-11-07 06:56:02,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 154. [2020-11-07 06:56:02,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2020-11-07 06:56:02,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 160 transitions. [2020-11-07 06:56:02,483 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 160 transitions. Word has length 139 [2020-11-07 06:56:02,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:56:02,483 INFO L481 AbstractCegarLoop]: Abstraction has 154 states and 160 transitions. [2020-11-07 06:56:02,483 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-11-07 06:56:02,483 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 160 transitions. [2020-11-07 06:56:02,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2020-11-07 06:56:02,484 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:56:02,484 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 15, 11, 7, 5, 5, 5, 5, 4, 4, 4, 4, 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, 1, 1] [2020-11-07 06:56:02,484 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-11-07 06:56:02,484 INFO L429 AbstractCegarLoop]: === Iteration 49 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:56:02,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:56:02,484 INFO L82 PathProgramCache]: Analyzing trace with hash -1247121986, now seen corresponding path program 33 times [2020-11-07 06:56:02,484 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:56:02,485 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [165156577] [2020-11-07 06:56:02,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:56:02,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:56:05,206 WARN L194 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 14 [2020-11-07 06:56:05,945 WARN L194 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 21 [2020-11-07 06:56:14,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:56:14,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:56:14,875 INFO L134 CoverageAnalysis]: Checked inductivity of 804 backedges. 23 proven. 777 refuted. 4 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:56:14,876 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [165156577] [2020-11-07 06:56:14,876 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:56:14,876 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-11-07 06:56:14,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582994529] [2020-11-07 06:56:14,876 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-11-07 06:56:14,876 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:56:14,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-11-07 06:56:14,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=695, Unknown=4, NotChecked=0, Total=756 [2020-11-07 06:56:14,877 INFO L87 Difference]: Start difference. First operand 154 states and 160 transitions. Second operand 28 states. [2020-11-07 06:56:15,592 WARN L194 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 40 [2020-11-07 06:56:16,314 WARN L194 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-11-07 06:56:17,146 WARN L194 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:56:17,965 WARN L194 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:56:18,657 WARN L194 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-11-07 06:56:19,325 WARN L194 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:56:19,845 WARN L194 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:56:20,555 WARN L194 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:56:21,380 WARN L194 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:56:22,035 WARN L194 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:56:22,776 WARN L194 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:56:23,312 WARN L194 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:56:24,118 WARN L194 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:56:24,813 WARN L194 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:56:25,644 WARN L194 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:56:26,558 WARN L194 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:56:27,206 WARN L194 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:56:27,896 WARN L194 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:56:28,761 WARN L194 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:56:29,615 WARN L194 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:56:30,078 WARN L194 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-11-07 06:56:31,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:56:31,357 INFO L93 Difference]: Finished difference Result 179 states and 193 transitions. [2020-11-07 06:56:31,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-11-07 06:56:31,361 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 143 [2020-11-07 06:56:31,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:56:31,363 INFO L225 Difference]: With dead ends: 179 [2020-11-07 06:56:31,363 INFO L226 Difference]: Without dead ends: 157 [2020-11-07 06:56:31,364 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 277 ImplicationChecksByTransitivity, 16.9s TimeCoverageRelationStatistics Valid=212, Invalid=2234, Unknown=4, NotChecked=0, Total=2450 [2020-11-07 06:56:31,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2020-11-07 06:56:31,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 155. [2020-11-07 06:56:31,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 155 states. [2020-11-07 06:56:31,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 159 transitions. [2020-11-07 06:56:31,472 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 159 transitions. Word has length 143 [2020-11-07 06:56:31,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:56:31,472 INFO L481 AbstractCegarLoop]: Abstraction has 155 states and 159 transitions. [2020-11-07 06:56:31,473 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-11-07 06:56:31,473 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 159 transitions. [2020-11-07 06:56:31,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2020-11-07 06:56:31,473 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:56:31,474 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 16, 12, 8, 6, 6, 4, 4, 4, 4, 4, 4, 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, 1, 1] [2020-11-07 06:56:31,474 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-11-07 06:56:31,474 INFO L429 AbstractCegarLoop]: === Iteration 50 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:56:31,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:56:31,474 INFO L82 PathProgramCache]: Analyzing trace with hash -73122299, now seen corresponding path program 34 times [2020-11-07 06:56:31,474 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:56:31,474 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [398915817] [2020-11-07 06:56:31,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:56:31,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:56:32,047 WARN L194 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 13 [2020-11-07 06:56:32,183 WARN L194 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 15 [2020-11-07 06:56:32,341 WARN L194 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-11-07 06:56:32,506 WARN L194 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 19 [2020-11-07 06:56:32,692 WARN L194 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 21 [2020-11-07 06:56:33,030 WARN L194 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 22 [2020-11-07 06:56:33,187 WARN L194 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 23 [2020-11-07 06:56:33,669 WARN L194 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 21 [2020-11-07 06:56:42,822 WARN L194 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-11-07 06:56:44,001 WARN L194 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 30 [2020-11-07 06:56:44,740 WARN L194 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 29 [2020-11-07 06:56:46,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:56:46,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:56:46,679 INFO L134 CoverageAnalysis]: Checked inductivity of 838 backedges. 0 proven. 838 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:56:46,679 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [398915817] [2020-11-07 06:56:46,679 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:56:46,679 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2020-11-07 06:56:46,679 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617656459] [2020-11-07 06:56:46,680 INFO L461 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-11-07 06:56:46,680 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:56:46,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-11-07 06:56:46,680 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=2902, Unknown=0, NotChecked=0, Total=3080 [2020-11-07 06:56:46,680 INFO L87 Difference]: Start difference. First operand 155 states and 159 transitions. Second operand 56 states. [2020-11-07 06:56:47,557 WARN L194 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 40 [2020-11-07 06:56:48,015 WARN L194 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 42 [2020-11-07 06:56:48,466 WARN L194 SmtUtils]: Spent 162.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 44 [2020-11-07 06:56:48,928 WARN L194 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-11-07 06:56:49,401 WARN L194 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 48 [2020-11-07 06:56:49,811 WARN L194 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 50 [2020-11-07 06:56:50,884 WARN L194 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 52 [2020-11-07 06:56:51,643 WARN L194 SmtUtils]: Spent 309.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 58 [2020-11-07 06:56:53,102 WARN L194 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 59 [2020-11-07 06:56:53,648 WARN L194 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 52 [2020-11-07 06:56:54,900 WARN L194 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 54 [2020-11-07 06:56:55,600 WARN L194 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 57 [2020-11-07 06:56:58,332 WARN L194 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:56:59,175 WARN L194 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:56:59,719 WARN L194 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:57:02,299 WARN L194 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:57:02,826 WARN L194 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:57:04,224 WARN L194 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:57:06,439 WARN L194 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:57:06,991 WARN L194 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:57:08,368 WARN L194 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:57:10,053 WARN L194 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:57:11,973 WARN L194 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:57:13,896 WARN L194 SmtUtils]: Spent 215.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:57:15,190 WARN L194 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:57:16,532 WARN L194 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:57:17,916 WARN L194 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:57:19,913 WARN L194 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:57:20,563 WARN L194 SmtUtils]: Spent 202.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-11-07 06:57:21,876 WARN L194 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-11-07 06:57:22,565 WARN L194 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:57:23,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:57:23,802 INFO L93 Difference]: Finished difference Result 173 states and 181 transitions. [2020-11-07 06:57:23,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-11-07 06:57:23,806 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 146 [2020-11-07 06:57:23,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:57:23,808 INFO L225 Difference]: With dead ends: 173 [2020-11-07 06:57:23,808 INFO L226 Difference]: Without dead ends: 167 [2020-11-07 06:57:23,809 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1790 ImplicationChecksByTransitivity, 31.4s TimeCoverageRelationStatistics Valid=647, Invalid=10483, Unknown=0, NotChecked=0, Total=11130 [2020-11-07 06:57:23,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2020-11-07 06:57:23,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 158. [2020-11-07 06:57:23,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 158 states. [2020-11-07 06:57:23,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 162 transitions. [2020-11-07 06:57:23,929 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 162 transitions. Word has length 146 [2020-11-07 06:57:23,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:57:23,929 INFO L481 AbstractCegarLoop]: Abstraction has 158 states and 162 transitions. [2020-11-07 06:57:23,929 INFO L482 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-11-07 06:57:23,929 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 162 transitions. [2020-11-07 06:57:23,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2020-11-07 06:57:23,930 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:57:23,930 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 16, 12, 8, 6, 6, 5, 5, 4, 4, 4, 4, 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, 1, 1] [2020-11-07 06:57:23,930 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-11-07 06:57:23,930 INFO L429 AbstractCegarLoop]: === Iteration 51 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:57:23,930 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:57:23,930 INFO L82 PathProgramCache]: Analyzing trace with hash 1654530719, now seen corresponding path program 35 times [2020-11-07 06:57:23,930 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:57:23,931 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1844246232] [2020-11-07 06:57:23,931 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:57:24,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:57:24,564 WARN L194 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 13 [2020-11-07 06:57:24,751 WARN L194 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 15 [2020-11-07 06:57:24,948 WARN L194 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-11-07 06:57:25,151 WARN L194 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-11-07 06:57:25,360 WARN L194 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-11-07 06:57:25,710 WARN L194 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 22 [2020-11-07 06:57:25,877 WARN L194 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 23 [2020-11-07 06:57:26,375 WARN L194 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 21 [2020-11-07 06:57:37,410 WARN L194 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-11-07 06:57:38,071 WARN L194 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 28 [2020-11-07 06:57:38,716 WARN L194 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 30 [2020-11-07 06:57:39,447 WARN L194 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 29 [2020-11-07 06:57:41,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:57:41,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:57:41,578 INFO L134 CoverageAnalysis]: Checked inductivity of 903 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:57:41,579 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1844246232] [2020-11-07 06:57:41,579 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:57:41,579 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2020-11-07 06:57:41,579 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379845574] [2020-11-07 06:57:41,579 INFO L461 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-11-07 06:57:41,579 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:57:41,580 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-11-07 06:57:41,580 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=3122, Unknown=0, NotChecked=0, Total=3306 [2020-11-07 06:57:41,580 INFO L87 Difference]: Start difference. First operand 158 states and 162 transitions. Second operand 58 states. [2020-11-07 06:57:42,476 WARN L194 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 40 [2020-11-07 06:57:42,948 WARN L194 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 42 [2020-11-07 06:57:43,436 WARN L194 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 44 [2020-11-07 06:57:43,946 WARN L194 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-11-07 06:57:44,438 WARN L194 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 48 [2020-11-07 06:57:44,849 WARN L194 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 50 [2020-11-07 06:57:46,005 WARN L194 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 52 [2020-11-07 06:57:46,789 WARN L194 SmtUtils]: Spent 322.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 58 [2020-11-07 06:57:48,622 WARN L194 SmtUtils]: Spent 306.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 59 [2020-11-07 06:57:49,225 WARN L194 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 52 [2020-11-07 06:57:50,583 WARN L194 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 54 [2020-11-07 06:57:51,427 WARN L194 SmtUtils]: Spent 361.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 57 [2020-11-07 06:57:54,569 WARN L194 SmtUtils]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:57:55,573 WARN L194 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:57:56,219 WARN L194 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:57:59,313 WARN L194 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:57:59,943 WARN L194 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:58:01,546 WARN L194 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:58:03,972 WARN L194 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:58:04,626 WARN L194 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:58:06,122 WARN L194 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:58:08,085 WARN L194 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:58:10,152 WARN L194 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:58:11,569 WARN L194 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-11-07 06:58:12,333 WARN L194 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:58:13,795 WARN L194 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:58:15,456 WARN L194 SmtUtils]: Spent 156.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:58:17,128 WARN L194 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:58:19,316 WARN L194 SmtUtils]: Spent 173.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:58:20,824 WARN L194 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:58:21,432 WARN L194 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:58:22,157 WARN L194 SmtUtils]: Spent 227.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-11-07 06:58:23,129 WARN L194 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-11-07 06:58:23,894 WARN L194 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:58:25,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:58:25,221 INFO L93 Difference]: Finished difference Result 191 states and 205 transitions. [2020-11-07 06:58:25,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-11-07 06:58:25,225 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 150 [2020-11-07 06:58:25,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:58:25,227 INFO L225 Difference]: With dead ends: 191 [2020-11-07 06:58:25,227 INFO L226 Difference]: Without dead ends: 171 [2020-11-07 06:58:25,228 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1916 ImplicationChecksByTransitivity, 36.6s TimeCoverageRelationStatistics Valid=670, Invalid=11320, Unknown=0, NotChecked=0, Total=11990 [2020-11-07 06:58:25,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2020-11-07 06:58:25,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 162. [2020-11-07 06:58:25,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2020-11-07 06:58:25,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 166 transitions. [2020-11-07 06:58:25,359 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 166 transitions. Word has length 150 [2020-11-07 06:58:25,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:58:25,359 INFO L481 AbstractCegarLoop]: Abstraction has 162 states and 166 transitions. [2020-11-07 06:58:25,359 INFO L482 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-11-07 06:58:25,359 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 166 transitions. [2020-11-07 06:58:25,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2020-11-07 06:58:25,360 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:58:25,360 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 16, 12, 8, 6, 6, 6, 6, 4, 4, 4, 4, 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, 1, 1] [2020-11-07 06:58:25,360 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-11-07 06:58:25,360 INFO L429 AbstractCegarLoop]: === Iteration 52 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:58:25,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:58:25,361 INFO L82 PathProgramCache]: Analyzing trace with hash 981477945, now seen corresponding path program 36 times [2020-11-07 06:58:25,361 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:58:25,361 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [667288420] [2020-11-07 06:58:25,361 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:58:25,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:58:25,794 WARN L194 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2020-11-07 06:58:28,028 WARN L194 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 21 [2020-11-07 06:58:28,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:58:28,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:58:28,983 INFO L134 CoverageAnalysis]: Checked inductivity of 972 backedges. 48 proven. 924 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:58:28,984 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [667288420] [2020-11-07 06:58:28,984 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:58:28,984 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-11-07 06:58:28,984 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997843674] [2020-11-07 06:58:28,986 INFO L461 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-11-07 06:58:28,986 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:58:28,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-11-07 06:58:28,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=700, Unknown=0, NotChecked=0, Total=756 [2020-11-07 06:58:28,987 INFO L87 Difference]: Start difference. First operand 162 states and 166 transitions. Second operand 28 states. [2020-11-07 06:58:29,795 WARN L194 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 40 [2020-11-07 06:58:31,880 WARN L194 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-11-07 06:58:42,210 WARN L194 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-11-07 06:58:43,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:58:43,590 INFO L93 Difference]: Finished difference Result 188 states and 200 transitions. [2020-11-07 06:58:43,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-11-07 06:58:43,595 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 154 [2020-11-07 06:58:43,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:58:43,597 INFO L225 Difference]: With dead ends: 188 [2020-11-07 06:58:43,597 INFO L226 Difference]: Without dead ends: 171 [2020-11-07 06:58:43,598 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 2 SyntacticMatches, 3 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 279 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=216, Invalid=2334, Unknown=0, NotChecked=0, Total=2550 [2020-11-07 06:58:43,599 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2020-11-07 06:58:43,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 163. [2020-11-07 06:58:43,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 163 states. [2020-11-07 06:58:43,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 163 states to 163 states and 167 transitions. [2020-11-07 06:58:43,788 INFO L78 Accepts]: Start accepts. Automaton has 163 states and 167 transitions. Word has length 154 [2020-11-07 06:58:43,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:58:43,788 INFO L481 AbstractCegarLoop]: Abstraction has 163 states and 167 transitions. [2020-11-07 06:58:43,788 INFO L482 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-11-07 06:58:43,789 INFO L276 IsEmpty]: Start isEmpty. Operand 163 states and 167 transitions. [2020-11-07 06:58:43,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2020-11-07 06:58:43,790 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:58:43,790 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 17, 12, 8, 6, 6, 5, 5, 5, 5, 4, 4, 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, 1, 1] [2020-11-07 06:58:43,790 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-11-07 06:58:43,790 INFO L429 AbstractCegarLoop]: === Iteration 53 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:58:43,790 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:58:43,791 INFO L82 PathProgramCache]: Analyzing trace with hash -1978724752, now seen corresponding path program 37 times [2020-11-07 06:58:43,791 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:58:43,791 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [904963091] [2020-11-07 06:58:43,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:58:43,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:58:45,646 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:58:45,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:58:45,686 INFO L134 CoverageAnalysis]: Checked inductivity of 987 backedges. 47 proven. 940 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:58:45,686 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [904963091] [2020-11-07 06:58:45,686 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:58:45,686 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-11-07 06:58:45,687 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065393464] [2020-11-07 06:58:45,687 INFO L461 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-11-07 06:58:45,687 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:58:45,687 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-11-07 06:58:45,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-11-07 06:58:45,687 INFO L87 Difference]: Start difference. First operand 163 states and 167 transitions. Second operand 25 states. [2020-11-07 06:58:58,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 06:58:58,600 INFO L93 Difference]: Finished difference Result 187 states and 198 transitions. [2020-11-07 06:58:58,605 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-11-07 06:58:58,605 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 155 [2020-11-07 06:58:58,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 06:58:58,606 INFO L225 Difference]: With dead ends: 187 [2020-11-07 06:58:58,606 INFO L226 Difference]: Without dead ends: 170 [2020-11-07 06:58:58,607 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 231 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=135, Invalid=2027, Unknown=0, NotChecked=0, Total=2162 [2020-11-07 06:58:58,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2020-11-07 06:58:58,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 164. [2020-11-07 06:58:58,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2020-11-07 06:58:58,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 168 transitions. [2020-11-07 06:58:58,744 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 168 transitions. Word has length 155 [2020-11-07 06:58:58,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 06:58:58,745 INFO L481 AbstractCegarLoop]: Abstraction has 164 states and 168 transitions. [2020-11-07 06:58:58,745 INFO L482 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-11-07 06:58:58,745 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 168 transitions. [2020-11-07 06:58:58,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2020-11-07 06:58:58,746 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 06:58:58,746 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 17, 13, 8, 6, 6, 5, 5, 5, 5, 4, 4, 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, 1, 1] [2020-11-07 06:58:58,746 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-11-07 06:58:58,746 INFO L429 AbstractCegarLoop]: === Iteration 54 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 06:58:58,747 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 06:58:58,747 INFO L82 PathProgramCache]: Analyzing trace with hash -1683767725, now seen corresponding path program 38 times [2020-11-07 06:58:58,747 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 06:58:58,747 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [754875316] [2020-11-07 06:58:58,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 06:58:58,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:58:59,206 WARN L194 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2020-11-07 06:58:59,345 WARN L194 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 13 [2020-11-07 06:58:59,508 WARN L194 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 15 [2020-11-07 06:58:59,699 WARN L194 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-11-07 06:58:59,918 WARN L194 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-11-07 06:59:00,183 WARN L194 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-11-07 06:59:00,618 WARN L194 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 22 [2020-11-07 06:59:00,819 WARN L194 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 23 [2020-11-07 06:59:01,369 WARN L194 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 21 [2020-11-07 06:59:15,013 WARN L194 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-11-07 06:59:15,776 WARN L194 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 28 [2020-11-07 06:59:16,530 WARN L194 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 30 [2020-11-07 06:59:17,397 WARN L194 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 29 [2020-11-07 06:59:19,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 06:59:19,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 06:59:19,905 INFO L134 CoverageAnalysis]: Checked inductivity of 999 backedges. 0 proven. 999 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 06:59:19,905 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [754875316] [2020-11-07 06:59:19,905 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 06:59:19,905 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2020-11-07 06:59:19,905 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [303910966] [2020-11-07 06:59:19,906 INFO L461 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-11-07 06:59:19,906 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 06:59:19,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-11-07 06:59:19,906 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=3350, Unknown=0, NotChecked=0, Total=3540 [2020-11-07 06:59:19,906 INFO L87 Difference]: Start difference. First operand 164 states and 168 transitions. Second operand 60 states. [2020-11-07 06:59:20,857 WARN L194 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 40 [2020-11-07 06:59:21,332 WARN L194 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 42 [2020-11-07 06:59:21,819 WARN L194 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 44 [2020-11-07 06:59:22,323 WARN L194 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-11-07 06:59:22,840 WARN L194 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 48 [2020-11-07 06:59:23,288 WARN L194 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 50 [2020-11-07 06:59:24,533 WARN L194 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 52 [2020-11-07 06:59:25,412 WARN L194 SmtUtils]: Spent 364.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 58 [2020-11-07 06:59:27,467 WARN L194 SmtUtils]: Spent 347.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 59 [2020-11-07 06:59:28,142 WARN L194 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 52 [2020-11-07 06:59:29,604 WARN L194 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 54 [2020-11-07 06:59:30,505 WARN L194 SmtUtils]: Spent 347.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 57 [2020-11-07 06:59:31,730 WARN L194 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-11-07 06:59:32,219 WARN L194 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 06:59:33,998 WARN L194 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:59:35,071 WARN L194 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:59:35,763 WARN L194 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:59:38,926 WARN L194 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:59:39,622 WARN L194 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:59:41,327 WARN L194 SmtUtils]: Spent 170.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:59:43,953 WARN L194 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:59:44,700 WARN L194 SmtUtils]: Spent 190.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:59:46,230 WARN L194 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:59:48,444 WARN L194 SmtUtils]: Spent 217.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:59:49,945 WARN L194 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-11-07 06:59:50,656 WARN L194 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:59:52,776 WARN L194 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:59:54,261 WARN L194 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:59:55,943 WARN L194 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 06:59:57,663 WARN L194 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 06:59:59,972 WARN L194 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 07:00:01,593 WARN L194 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 07:00:02,292 WARN L194 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 07:00:03,358 WARN L194 SmtUtils]: Spent 210.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 07:00:04,032 WARN L194 SmtUtils]: Spent 159.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 07:00:04,766 WARN L194 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-11-07 07:00:06,174 WARN L194 SmtUtils]: Spent 218.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-11-07 07:00:07,018 WARN L194 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 07:00:08,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 07:00:08,291 INFO L93 Difference]: Finished difference Result 197 states and 211 transitions. [2020-11-07 07:00:08,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-11-07 07:00:08,297 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 156 [2020-11-07 07:00:08,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 07:00:08,299 INFO L225 Difference]: With dead ends: 197 [2020-11-07 07:00:08,299 INFO L226 Difference]: Without dead ends: 177 [2020-11-07 07:00:08,301 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 112 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2046 ImplicationChecksByTransitivity, 43.3s TimeCoverageRelationStatistics Valid=693, Invalid=12189, Unknown=0, NotChecked=0, Total=12882 [2020-11-07 07:00:08,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2020-11-07 07:00:08,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 168. [2020-11-07 07:00:08,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 168 states. [2020-11-07 07:00:08,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 168 states to 168 states and 172 transitions. [2020-11-07 07:00:08,444 INFO L78 Accepts]: Start accepts. Automaton has 168 states and 172 transitions. Word has length 156 [2020-11-07 07:00:08,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 07:00:08,445 INFO L481 AbstractCegarLoop]: Abstraction has 168 states and 172 transitions. [2020-11-07 07:00:08,445 INFO L482 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-11-07 07:00:08,445 INFO L276 IsEmpty]: Start isEmpty. Operand 168 states and 172 transitions. [2020-11-07 07:00:08,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2020-11-07 07:00:08,446 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 07:00:08,446 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 17, 13, 8, 6, 6, 6, 6, 5, 5, 4, 4, 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, 1, 1] [2020-11-07 07:00:08,446 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-11-07 07:00:08,446 INFO L429 AbstractCegarLoop]: === Iteration 55 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 07:00:08,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 07:00:08,447 INFO L82 PathProgramCache]: Analyzing trace with hash -81212435, now seen corresponding path program 39 times [2020-11-07 07:00:08,447 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 07:00:08,447 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [230824670] [2020-11-07 07:00:08,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 07:00:08,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 07:00:11,614 WARN L194 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 21 [2020-11-07 07:00:12,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 07:00:12,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 07:00:12,675 INFO L134 CoverageAnalysis]: Checked inductivity of 1071 backedges. 50 proven. 1021 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 07:00:12,675 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [230824670] [2020-11-07 07:00:12,675 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 07:00:12,675 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-11-07 07:00:12,676 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1986049117] [2020-11-07 07:00:12,676 INFO L461 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-11-07 07:00:12,676 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 07:00:12,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-11-07 07:00:12,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=754, Unknown=0, NotChecked=0, Total=812 [2020-11-07 07:00:12,677 INFO L87 Difference]: Start difference. First operand 168 states and 172 transitions. Second operand 29 states. [2020-11-07 07:00:13,707 WARN L194 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 40 [2020-11-07 07:00:27,743 WARN L194 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-11-07 07:00:29,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 07:00:29,337 INFO L93 Difference]: Finished difference Result 194 states and 206 transitions. [2020-11-07 07:00:29,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-11-07 07:00:29,343 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 160 [2020-11-07 07:00:29,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 07:00:29,344 INFO L225 Difference]: With dead ends: 194 [2020-11-07 07:00:29,344 INFO L226 Difference]: Without dead ends: 177 [2020-11-07 07:00:29,345 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 2 SyntacticMatches, 3 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 303 ImplicationChecksByTransitivity, 8.1s TimeCoverageRelationStatistics Valid=225, Invalid=2531, Unknown=0, NotChecked=0, Total=2756 [2020-11-07 07:00:29,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2020-11-07 07:00:29,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 169. [2020-11-07 07:00:29,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2020-11-07 07:00:29,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 173 transitions. [2020-11-07 07:00:29,493 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 173 transitions. Word has length 160 [2020-11-07 07:00:29,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 07:00:29,493 INFO L481 AbstractCegarLoop]: Abstraction has 169 states and 173 transitions. [2020-11-07 07:00:29,493 INFO L482 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-11-07 07:00:29,493 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 173 transitions. [2020-11-07 07:00:29,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2020-11-07 07:00:29,494 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 07:00:29,494 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 18, 13, 8, 6, 6, 5, 5, 5, 5, 5, 5, 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, 1, 1] [2020-11-07 07:00:29,494 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-11-07 07:00:29,494 INFO L429 AbstractCegarLoop]: === Iteration 56 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 07:00:29,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 07:00:29,495 INFO L82 PathProgramCache]: Analyzing trace with hash -562388164, now seen corresponding path program 40 times [2020-11-07 07:00:29,495 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 07:00:29,495 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1511174075] [2020-11-07 07:00:29,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 07:00:29,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 07:00:31,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 07:00:31,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 07:00:31,582 INFO L134 CoverageAnalysis]: Checked inductivity of 1087 backedges. 49 proven. 1038 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 07:00:31,583 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1511174075] [2020-11-07 07:00:31,583 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 07:00:31,583 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-11-07 07:00:31,583 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432442995] [2020-11-07 07:00:31,583 INFO L461 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-11-07 07:00:31,584 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 07:00:31,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-11-07 07:00:31,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=601, Unknown=0, NotChecked=0, Total=650 [2020-11-07 07:00:31,584 INFO L87 Difference]: Start difference. First operand 169 states and 173 transitions. Second operand 26 states. [2020-11-07 07:00:45,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 07:00:45,963 INFO L93 Difference]: Finished difference Result 192 states and 203 transitions. [2020-11-07 07:00:45,969 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-11-07 07:00:45,969 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 161 [2020-11-07 07:00:45,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 07:00:45,971 INFO L225 Difference]: With dead ends: 192 [2020-11-07 07:00:45,971 INFO L226 Difference]: Without dead ends: 175 [2020-11-07 07:00:45,972 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=141, Invalid=2211, Unknown=0, NotChecked=0, Total=2352 [2020-11-07 07:00:45,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2020-11-07 07:00:46,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 171. [2020-11-07 07:00:46,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2020-11-07 07:00:46,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 175 transitions. [2020-11-07 07:00:46,101 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 175 transitions. Word has length 161 [2020-11-07 07:00:46,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 07:00:46,101 INFO L481 AbstractCegarLoop]: Abstraction has 171 states and 175 transitions. [2020-11-07 07:00:46,102 INFO L482 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-11-07 07:00:46,102 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 175 transitions. [2020-11-07 07:00:46,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2020-11-07 07:00:46,102 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 07:00:46,103 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 18, 14, 9, 6, 6, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 07:00:46,103 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-11-07 07:00:46,103 INFO L429 AbstractCegarLoop]: === Iteration 57 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 07:00:46,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 07:00:46,103 INFO L82 PathProgramCache]: Analyzing trace with hash 331721174, now seen corresponding path program 41 times [2020-11-07 07:00:46,104 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 07:00:46,104 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1245538267] [2020-11-07 07:00:46,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 07:00:46,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 07:00:46,630 WARN L194 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2020-11-07 07:00:46,796 WARN L194 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 13 [2020-11-07 07:00:46,993 WARN L194 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 15 [2020-11-07 07:00:47,208 WARN L194 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-11-07 07:00:47,439 WARN L194 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-11-07 07:00:47,689 WARN L194 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-11-07 07:00:48,105 WARN L194 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 22 [2020-11-07 07:00:48,308 WARN L194 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 23 [2020-11-07 07:00:48,495 WARN L194 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-11-07 07:00:48,902 WARN L194 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 21 [2020-11-07 07:01:04,410 WARN L194 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 21 [2020-11-07 07:01:05,256 WARN L194 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 28 [2020-11-07 07:01:06,092 WARN L194 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 30 [2020-11-07 07:01:06,974 WARN L194 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 29 [2020-11-07 07:01:07,788 WARN L194 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 19 [2020-11-07 07:01:09,052 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 07:01:09,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 07:01:09,645 INFO L134 CoverageAnalysis]: Checked inductivity of 1106 backedges. 0 proven. 1106 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 07:01:09,645 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1245538267] [2020-11-07 07:01:09,646 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 07:01:09,646 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62] total 62 [2020-11-07 07:01:09,646 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590709858] [2020-11-07 07:01:09,646 INFO L461 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-11-07 07:01:09,646 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 07:01:09,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-11-07 07:01:09,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=3586, Unknown=0, NotChecked=0, Total=3782 [2020-11-07 07:01:09,647 INFO L87 Difference]: Start difference. First operand 171 states and 175 transitions. Second operand 62 states. [2020-11-07 07:01:10,762 WARN L194 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 40 [2020-11-07 07:01:11,355 WARN L194 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 42 [2020-11-07 07:01:11,988 WARN L194 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 44 [2020-11-07 07:01:12,693 WARN L194 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 46 [2020-11-07 07:01:13,366 WARN L194 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 54 DAG size of output: 48 [2020-11-07 07:01:13,873 WARN L194 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 50 [2020-11-07 07:01:15,477 WARN L194 SmtUtils]: Spent 321.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 52 [2020-11-07 07:01:16,576 WARN L194 SmtUtils]: Spent 409.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 58 [2020-11-07 07:01:18,955 WARN L194 SmtUtils]: Spent 360.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 59 [2020-11-07 07:01:19,668 WARN L194 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 52 [2020-11-07 07:01:21,475 WARN L194 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 54 [2020-11-07 07:01:22,482 WARN L194 SmtUtils]: Spent 395.00 ms on a formula simplification. DAG size of input: 62 DAG size of output: 57 [2020-11-07 07:01:24,033 WARN L194 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-11-07 07:01:24,579 WARN L194 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-11-07 07:01:25,817 WARN L194 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-11-07 07:01:26,616 WARN L194 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 07:01:27,943 WARN L194 SmtUtils]: Spent 233.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 07:01:28,755 WARN L194 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 07:01:30,221 WARN L194 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-11-07 07:01:30,768 WARN L194 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-11-07 07:01:32,552 WARN L194 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 07:01:33,320 WARN L194 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 07:01:34,553 WARN L194 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-11-07 07:01:35,362 WARN L194 SmtUtils]: Spent 220.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 07:01:36,879 WARN L194 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-11-07 07:01:37,416 WARN L194 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-11-07 07:01:38,626 WARN L194 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 07:01:39,495 WARN L194 SmtUtils]: Spent 226.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 07:01:41,530 WARN L194 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 07:01:42,098 WARN L194 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-11-07 07:01:43,299 WARN L194 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-11-07 07:01:44,127 WARN L194 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 07:01:45,936 WARN L194 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-11-07 07:01:46,738 WARN L194 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 07:01:48,557 WARN L194 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-11-07 07:01:49,328 WARN L194 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 07:01:50,313 WARN L194 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-11-07 07:01:51,042 WARN L194 SmtUtils]: Spent 154.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 07:01:52,422 WARN L194 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-11-07 07:01:53,176 WARN L194 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 07:01:55,089 WARN L194 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 07:01:55,775 WARN L194 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-11-07 07:01:57,124 WARN L194 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-11-07 07:01:57,910 WARN L194 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 07:01:59,900 WARN L194 SmtUtils]: Spent 245.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 07:02:00,716 WARN L194 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 07:02:01,964 WARN L194 SmtUtils]: Spent 179.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 07:02:02,707 WARN L194 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-11-07 07:02:04,320 WARN L194 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-11-07 07:02:05,114 WARN L194 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-11-07 07:02:05,940 WARN L194 SmtUtils]: Spent 183.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-11-07 07:02:07,948 WARN L194 SmtUtils]: Spent 208.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-11-07 07:02:08,936 WARN L194 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-11-07 07:02:10,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 07:02:10,569 INFO L93 Difference]: Finished difference Result 204 states and 218 transitions. [2020-11-07 07:02:10,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-11-07 07:02:10,574 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 163 [2020-11-07 07:02:10,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 07:02:10,576 INFO L225 Difference]: With dead ends: 204 [2020-11-07 07:02:10,576 INFO L226 Difference]: Without dead ends: 184 [2020-11-07 07:02:10,577 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2180 ImplicationChecksByTransitivity, 48.9s TimeCoverageRelationStatistics Valid=716, Invalid=13090, Unknown=0, NotChecked=0, Total=13806 [2020-11-07 07:02:10,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2020-11-07 07:02:10,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 175. [2020-11-07 07:02:10,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2020-11-07 07:02:10,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 179 transitions. [2020-11-07 07:02:10,721 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 179 transitions. Word has length 163 [2020-11-07 07:02:10,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 07:02:10,721 INFO L481 AbstractCegarLoop]: Abstraction has 175 states and 179 transitions. [2020-11-07 07:02:10,721 INFO L482 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-11-07 07:02:10,721 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 179 transitions. [2020-11-07 07:02:10,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 168 [2020-11-07 07:02:10,722 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 07:02:10,722 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 18, 14, 9, 6, 6, 6, 6, 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, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 07:02:10,722 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-11-07 07:02:10,722 INFO L429 AbstractCegarLoop]: === Iteration 58 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 07:02:10,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 07:02:10,723 INFO L82 PathProgramCache]: Analyzing trace with hash 1905475056, now seen corresponding path program 42 times [2020-11-07 07:02:10,723 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 07:02:10,723 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [811664186] [2020-11-07 07:02:10,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 07:02:10,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 07:02:11,164 WARN L194 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2020-11-07 07:02:14,142 WARN L194 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 21 [2020-11-07 07:02:14,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 07:02:14,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 07:02:15,263 INFO L134 CoverageAnalysis]: Checked inductivity of 1181 backedges. 52 proven. 1129 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 07:02:15,263 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [811664186] [2020-11-07 07:02:15,263 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 07:02:15,263 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-11-07 07:02:15,263 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108739900] [2020-11-07 07:02:15,263 INFO L461 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-11-07 07:02:15,264 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 07:02:15,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-11-07 07:02:15,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=810, Unknown=0, NotChecked=0, Total=870 [2020-11-07 07:02:15,264 INFO L87 Difference]: Start difference. First operand 175 states and 179 transitions. Second operand 30 states. [2020-11-07 07:02:16,289 WARN L194 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 40 [2020-11-07 07:02:17,211 WARN L194 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-11-07 07:02:18,146 WARN L194 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-11-07 07:02:19,082 WARN L194 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-11-07 07:02:19,928 WARN L194 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-11-07 07:02:22,190 WARN L194 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-11-07 07:02:23,071 WARN L194 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-11-07 07:02:23,727 WARN L194 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-11-07 07:02:25,842 WARN L194 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-11-07 07:02:26,484 WARN L194 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-11-07 07:02:27,450 WARN L194 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-11-07 07:02:28,285 WARN L194 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-11-07 07:02:28,847 WARN L194 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-11-07 07:02:29,497 WARN L194 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 41 [2020-11-07 07:02:31,028 WARN L194 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-11-07 07:02:34,065 WARN L194 SmtUtils]: Spent 174.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-11-07 07:02:35,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 07:02:35,998 INFO L93 Difference]: Finished difference Result 201 states and 213 transitions. [2020-11-07 07:02:36,005 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-11-07 07:02:36,005 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 167 [2020-11-07 07:02:36,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 07:02:36,006 INFO L225 Difference]: With dead ends: 201 [2020-11-07 07:02:36,007 INFO L226 Difference]: Without dead ends: 184 [2020-11-07 07:02:36,008 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 2 SyntacticMatches, 3 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=234, Invalid=2736, Unknown=0, NotChecked=0, Total=2970 [2020-11-07 07:02:36,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2020-11-07 07:02:36,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 176. [2020-11-07 07:02:36,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2020-11-07 07:02:36,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 180 transitions. [2020-11-07 07:02:36,178 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 180 transitions. Word has length 167 [2020-11-07 07:02:36,178 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 07:02:36,178 INFO L481 AbstractCegarLoop]: Abstraction has 176 states and 180 transitions. [2020-11-07 07:02:36,178 INFO L482 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-11-07 07:02:36,178 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 180 transitions. [2020-11-07 07:02:36,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 169 [2020-11-07 07:02:36,179 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 07:02:36,179 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 19, 14, 9, 6, 6, 5, 5, 5, 5, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 07:02:36,179 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2020-11-07 07:02:36,179 INFO L429 AbstractCegarLoop]: === Iteration 59 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 07:02:36,179 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 07:02:36,179 INFO L82 PathProgramCache]: Analyzing trace with hash 895381913, now seen corresponding path program 43 times [2020-11-07 07:02:36,179 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 07:02:36,180 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1583722984] [2020-11-07 07:02:36,180 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 07:02:36,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 07:02:38,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 07:02:38,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 07:02:38,433 INFO L134 CoverageAnalysis]: Checked inductivity of 1198 backedges. 51 proven. 1147 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 07:02:38,433 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1583722984] [2020-11-07 07:02:38,434 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-11-07 07:02:38,434 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-11-07 07:02:38,434 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [770154242] [2020-11-07 07:02:38,434 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-11-07 07:02:38,434 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 07:02:38,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-11-07 07:02:38,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=651, Unknown=0, NotChecked=0, Total=702 [2020-11-07 07:02:38,435 INFO L87 Difference]: Start difference. First operand 176 states and 180 transitions. Second operand 27 states. [2020-11-07 07:02:39,837 WARN L194 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 38 [2020-11-07 07:02:55,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 07:02:55,730 INFO L93 Difference]: Finished difference Result 198 states and 209 transitions. [2020-11-07 07:02:55,737 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-11-07 07:02:55,737 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 168 [2020-11-07 07:02:55,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 07:02:55,739 INFO L225 Difference]: With dead ends: 198 [2020-11-07 07:02:55,739 INFO L226 Difference]: Without dead ends: 181 [2020-11-07 07:02:55,739 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 5.8s TimeCoverageRelationStatistics Valid=147, Invalid=2403, Unknown=0, NotChecked=0, Total=2550 [2020-11-07 07:02:55,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2020-11-07 07:02:55,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 179. [2020-11-07 07:02:55,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 179 states. [2020-11-07 07:02:55,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 183 transitions. [2020-11-07 07:02:55,892 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 183 transitions. Word has length 168 [2020-11-07 07:02:55,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 07:02:55,892 INFO L481 AbstractCegarLoop]: Abstraction has 179 states and 183 transitions. [2020-11-07 07:02:55,892 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-11-07 07:02:55,892 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 183 transitions. [2020-11-07 07:02:55,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2020-11-07 07:02:55,893 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 07:02:55,893 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 19, 15, 10, 7, 7, 5, 5, 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, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 07:02:55,893 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2020-11-07 07:02:55,893 INFO L429 AbstractCegarLoop]: === Iteration 60 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 07:02:55,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 07:02:55,894 INFO L82 PathProgramCache]: Analyzing trace with hash 895494291, now seen corresponding path program 44 times [2020-11-07 07:02:55,894 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 07:02:55,894 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1121177365] [2020-11-07 07:02:55,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 07:02:56,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 07:02:56,261 WARN L194 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 15 DAG size of output: 9 [2020-11-07 07:02:56,410 WARN L194 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2020-11-07 07:02:56,584 WARN L194 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 19 DAG size of output: 13 [2020-11-07 07:02:56,773 WARN L194 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 15 [2020-11-07 07:02:56,990 WARN L194 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-11-07 07:02:57,238 WARN L194 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 19 [2020-11-07 07:02:57,518 WARN L194 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-11-07 07:02:57,749 WARN L194 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 16 [2020-11-07 07:02:57,978 WARN L194 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 22 [2020-11-07 07:02:58,197 WARN L194 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 23 [2020-11-07 07:02:58,406 WARN L194 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 16 [2020-11-07 07:02:58,863 WARN L194 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 21 [2020-11-07 07:02:59,775 WARN L194 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-11-07 07:03:00,055 WARN L194 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 19 [2020-11-07 07:03:00,340 WARN L194 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18