/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data --core.log.level.for.class de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf -i ../../../trunk/examples/svcomp/verifythis/prefixsum_iter.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-c225d54 [2021-05-03 00:37:01,045 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-03 00:37:01,047 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-03 00:37:01,076 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-03 00:37:01,094 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-05-03 00:37:01,096 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-05-03 00:37:01,097 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-05-03 00:37:01,098 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-05-03 00:37:01,101 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-05-03 00:37:01,101 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-05-03 00:37:01,113 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-05-03 00:37:01,118 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-05-03 00:37:01,119 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-05-03 00:37:01,120 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-05-03 00:37:01,121 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-05-03 00:37:01,123 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-05-03 00:37:01,128 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-05-03 00:37:01,135 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-03 00:37:01,135 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-03 00:37:01,136 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-03 00:37:01,137 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationJordan_32.epf [2021-05-03 00:37:01,155 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-03 00:37:01,156 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-03 00:37:01,159 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-03 00:37:01,159 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-03 00:37:01,159 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-03 00:37:01,159 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-03 00:37:01,160 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-03 00:37:01,160 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-03 00:37:01,160 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-03 00:37:01,161 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-03 00:37:01,161 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-03 00:37:01,162 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-03 00:37:01,162 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-03 00:37:01,162 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-03 00:37:01,162 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-03 00:37:01,162 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-03 00:37:01,162 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-03 00:37:01,162 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-03 00:37:01,163 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-03 00:37:01,163 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-03 00:37:01,163 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-05-03 00:37:01,163 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-05-03 00:37:01,163 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=JORDAN [2021-05-03 00:37:01,163 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-03 00:37:01,459 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-03 00:37:01,481 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-03 00:37:01,483 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-03 00:37:01,484 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-03 00:37:01,484 INFO L275 PluginConnector]: CDTParser initialized [2021-05-03 00:37:01,485 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/verifythis/prefixsum_iter.c [2021-05-03 00:37:01,541 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4cae21afe/54085995301545dea899a96ea4e0dcdb/FLAG367674f39 [2021-05-03 00:37:01,880 INFO L306 CDTParser]: Found 1 translation units. [2021-05-03 00:37:01,881 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/verifythis/prefixsum_iter.c [2021-05-03 00:37:01,885 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4cae21afe/54085995301545dea899a96ea4e0dcdb/FLAG367674f39 [2021-05-03 00:37:02,301 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4cae21afe/54085995301545dea899a96ea4e0dcdb [2021-05-03 00:37:02,303 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-03 00:37:02,304 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-05-03 00:37:02,306 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-03 00:37:02,306 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-03 00:37:02,309 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-03 00:37:02,310 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.05 12:37:02" (1/1) ... [2021-05-03 00:37:02,311 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@cf343ea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:37:02, skipping insertion in model container [2021-05-03 00:37:02,311 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.05 12:37:02" (1/1) ... [2021-05-03 00:37:02,316 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-03 00:37:02,330 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-03 00:37:02,407 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/verifythis/prefixsum_iter.c[526,539] [2021-05-03 00:37:02,422 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-03 00:37:02,437 INFO L203 MainTranslator]: Completed pre-run [2021-05-03 00:37:02,471 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/verifythis/prefixsum_iter.c[526,539] [2021-05-03 00:37:02,502 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-03 00:37:02,522 INFO L208 MainTranslator]: Completed translation [2021-05-03 00:37:02,523 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:37:02 WrapperNode [2021-05-03 00:37:02,523 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-03 00:37:02,525 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-03 00:37:02,525 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-03 00:37:02,525 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-03 00:37:02,534 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:37:02" (1/1) ... [2021-05-03 00:37:02,534 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:37:02" (1/1) ... [2021-05-03 00:37:02,550 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:37:02" (1/1) ... [2021-05-03 00:37:02,550 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:37:02" (1/1) ... [2021-05-03 00:37:02,561 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:37:02" (1/1) ... [2021-05-03 00:37:02,569 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:37:02" (1/1) ... [2021-05-03 00:37:02,572 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:37:02" (1/1) ... [2021-05-03 00:37:02,574 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-03 00:37:02,575 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-03 00:37:02,575 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-03 00:37:02,575 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-03 00:37:02,575 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:37:02" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-03 00:37:02,635 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-03 00:37:02,635 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-03 00:37:02,636 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-03 00:37:02,636 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-03 00:37:02,636 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-03 00:37:02,636 INFO L138 BoogieDeclarations]: Found implementation of procedure upsweep [2021-05-03 00:37:02,637 INFO L138 BoogieDeclarations]: Found implementation of procedure downsweep [2021-05-03 00:37:02,637 INFO L138 BoogieDeclarations]: Found implementation of procedure is_pow2 [2021-05-03 00:37:02,637 INFO L138 BoogieDeclarations]: Found implementation of procedure check [2021-05-03 00:37:02,637 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-03 00:37:02,637 INFO L138 BoogieDeclarations]: Found implementation of procedure #Ultimate.meminit [2021-05-03 00:37:02,637 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2021-05-03 00:37:02,638 INFO L130 BoogieDeclarations]: Found specification of procedure free [2021-05-03 00:37:02,638 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-05-03 00:37:02,638 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-03 00:37:02,638 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-03 00:37:02,638 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-03 00:37:02,639 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-03 00:37:02,639 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-03 00:37:02,640 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-03 00:37:02,640 INFO L130 BoogieDeclarations]: Found specification of procedure upsweep [2021-05-03 00:37:02,641 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-03 00:37:02,641 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-03 00:37:02,641 INFO L130 BoogieDeclarations]: Found specification of procedure downsweep [2021-05-03 00:37:02,641 INFO L130 BoogieDeclarations]: Found specification of procedure is_pow2 [2021-05-03 00:37:02,641 INFO L130 BoogieDeclarations]: Found specification of procedure check [2021-05-03 00:37:02,641 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-03 00:37:02,641 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-05-03 00:37:02,641 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.meminit [2021-05-03 00:37:02,641 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-03 00:37:02,641 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-03 00:37:02,642 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-03 00:37:02,642 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-03 00:37:02,972 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-03 00:37:02,973 INFO L299 CfgBuilder]: Removed 7 assume(true) statements. [2021-05-03 00:37:02,974 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.05 12:37:02 BoogieIcfgContainer [2021-05-03 00:37:02,974 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-03 00:37:02,975 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-03 00:37:02,975 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-03 00:37:02,977 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-03 00:37:02,977 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.05 12:37:02" (1/3) ... [2021-05-03 00:37:02,978 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50cbcdfe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.05 12:37:02, skipping insertion in model container [2021-05-03 00:37:02,978 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.05 12:37:02" (2/3) ... [2021-05-03 00:37:02,978 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50cbcdfe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.05 12:37:02, skipping insertion in model container [2021-05-03 00:37:02,978 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.05 12:37:02" (3/3) ... [2021-05-03 00:37:02,979 INFO L111 eAbstractionObserver]: Analyzing ICFG prefixsum_iter.c [2021-05-03 00:37:02,982 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-05-03 00:37:02,985 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-03 00:37:02,995 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-03 00:37:03,009 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-03 00:37:03,009 INFO L377 AbstractCegarLoop]: Hoare is true [2021-05-03 00:37:03,009 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-05-03 00:37:03,009 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-03 00:37:03,009 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-03 00:37:03,009 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-03 00:37:03,009 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-03 00:37:03,009 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-03 00:37:03,019 INFO L276 IsEmpty]: Start isEmpty. Operand has 64 states, 42 states have (on average 1.4047619047619047) internal successors, (59), 43 states have internal predecessors, (59), 11 states have call successors, (11), 9 states have call predecessors, (11), 9 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2021-05-03 00:37:03,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-03 00:37:03,024 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:37:03,025 INFO L523 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:37:03,025 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:37:03,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:37:03,029 INFO L82 PathProgramCache]: Analyzing trace with hash 242194828, now seen corresponding path program 1 times [2021-05-03 00:37:03,034 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:37:03,035 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1025641536] [2021-05-03 00:37:03,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:37:03,088 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:37:03,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:03,230 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:37:03,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:03,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:37:03,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:03,272 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:37:03,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:03,290 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:37:03,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:03,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:37:03,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:03,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:37:03,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:03,330 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-05-03 00:37:03,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:03,341 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-05-03 00:37:03,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:03,350 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:37:03,365 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:37:03,365 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1025641536] [2021-05-03 00:37:03,367 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1025641536] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:37:03,367 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:37:03,367 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-03 00:37:03,368 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864162464] [2021-05-03 00:37:03,377 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-03 00:37:03,378 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:37:03,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-03 00:37:03,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-03 00:37:03,388 INFO L87 Difference]: Start difference. First operand has 64 states, 42 states have (on average 1.4047619047619047) internal successors, (59), 43 states have internal predecessors, (59), 11 states have call successors, (11), 9 states have call predecessors, (11), 9 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) Second operand has 4 states, 4 states have (on average 7.5) internal successors, (30), 2 states have internal predecessors, (30), 2 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-03 00:37:03,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:37:03,674 INFO L93 Difference]: Finished difference Result 127 states and 171 transitions. [2021-05-03 00:37:03,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-03 00:37:03,675 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 2 states have internal predecessors, (30), 2 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 54 [2021-05-03 00:37:03,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:37:03,681 INFO L225 Difference]: With dead ends: 127 [2021-05-03 00:37:03,681 INFO L226 Difference]: Without dead ends: 63 [2021-05-03 00:37:03,683 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 60.6ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-03 00:37:03,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-05-03 00:37:03,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 57. [2021-05-03 00:37:03,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 38 states have (on average 1.1842105263157894) internal successors, (45), 38 states have internal predecessors, (45), 11 states have call successors, (11), 9 states have call predecessors, (11), 7 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-03 00:37:03,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 65 transitions. [2021-05-03 00:37:03,755 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 65 transitions. Word has length 54 [2021-05-03 00:37:03,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:37:03,755 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 65 transitions. [2021-05-03 00:37:03,755 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 7.5) internal successors, (30), 2 states have internal predecessors, (30), 2 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-03 00:37:03,755 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 65 transitions. [2021-05-03 00:37:03,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-05-03 00:37:03,757 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:37:03,757 INFO L523 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:37:03,757 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-03 00:37:03,758 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:37:03,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:37:03,758 INFO L82 PathProgramCache]: Analyzing trace with hash -73515768, now seen corresponding path program 1 times [2021-05-03 00:37:03,758 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:37:03,759 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1609364419] [2021-05-03 00:37:03,759 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:37:03,762 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:37:03,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:03,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:37:03,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:03,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:37:03,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:03,902 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:37:03,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:03,906 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:37:03,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:03,915 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:37:03,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:03,919 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:37:03,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:03,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 35 [2021-05-03 00:37:03,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:03,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2021-05-03 00:37:03,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:03,932 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:37:03,932 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:37:03,932 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1609364419] [2021-05-03 00:37:03,932 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1609364419] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:37:03,932 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:37:03,933 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-03 00:37:03,933 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848671681] [2021-05-03 00:37:03,934 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-03 00:37:03,934 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:37:03,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-03 00:37:03,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-05-03 00:37:03,935 INFO L87 Difference]: Start difference. First operand 57 states and 65 transitions. Second operand has 8 states, 8 states have (on average 3.75) internal successors, (30), 5 states have internal predecessors, (30), 3 states have call successors, (11), 5 states have call predecessors, (11), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-03 00:37:04,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:37:04,387 INFO L93 Difference]: Finished difference Result 81 states and 95 transitions. [2021-05-03 00:37:04,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-03 00:37:04,388 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 5 states have internal predecessors, (30), 3 states have call successors, (11), 5 states have call predecessors, (11), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 54 [2021-05-03 00:37:04,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:37:04,392 INFO L225 Difference]: With dead ends: 81 [2021-05-03 00:37:04,392 INFO L226 Difference]: Without dead ends: 65 [2021-05-03 00:37:04,395 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 163.1ms TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-05-03 00:37:04,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-05-03 00:37:04,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 58. [2021-05-03 00:37:04,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 39 states have (on average 1.1794871794871795) internal successors, (46), 39 states have internal predecessors, (46), 11 states have call successors, (11), 9 states have call predecessors, (11), 7 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2021-05-03 00:37:04,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 66 transitions. [2021-05-03 00:37:04,423 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 66 transitions. Word has length 54 [2021-05-03 00:37:04,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:37:04,424 INFO L480 AbstractCegarLoop]: Abstraction has 58 states and 66 transitions. [2021-05-03 00:37:04,424 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 3.75) internal successors, (30), 5 states have internal predecessors, (30), 3 states have call successors, (11), 5 states have call predecessors, (11), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-03 00:37:04,424 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 66 transitions. [2021-05-03 00:37:04,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-05-03 00:37:04,429 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:37:04,429 INFO L523 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:37:04,429 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-03 00:37:04,429 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:37:04,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:37:04,430 INFO L82 PathProgramCache]: Analyzing trace with hash -628313814, now seen corresponding path program 1 times [2021-05-03 00:37:04,430 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:37:04,431 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [413100076] [2021-05-03 00:37:04,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:37:04,433 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:37:04,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:04,653 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:37:04,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:04,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:37:04,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:04,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:37:04,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:04,673 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:37:04,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:04,686 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:37:04,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:04,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:37:04,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:04,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-03 00:37:04,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:04,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2021-05-03 00:37:04,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:04,790 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-03 00:37:04,790 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:37:04,790 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [413100076] [2021-05-03 00:37:04,790 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [413100076] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:37:04,790 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:37:04,791 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-03 00:37:04,791 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561860673] [2021-05-03 00:37:04,791 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-03 00:37:04,792 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:37:04,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-03 00:37:04,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=208, Unknown=0, NotChecked=0, Total=240 [2021-05-03 00:37:04,793 INFO L87 Difference]: Start difference. First operand 58 states and 66 transitions. Second operand has 16 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 12 states have internal predecessors, (34), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-03 00:37:05,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:37:05,734 INFO L93 Difference]: Finished difference Result 81 states and 93 transitions. [2021-05-03 00:37:05,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-03 00:37:05,735 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 12 states have internal predecessors, (34), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 56 [2021-05-03 00:37:05,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:37:05,736 INFO L225 Difference]: With dead ends: 81 [2021-05-03 00:37:05,736 INFO L226 Difference]: Without dead ends: 79 [2021-05-03 00:37:05,736 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 583.3ms TimeCoverageRelationStatistics Valid=146, Invalid=724, Unknown=0, NotChecked=0, Total=870 [2021-05-03 00:37:05,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-05-03 00:37:05,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 74. [2021-05-03 00:37:05,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 50 states have (on average 1.18) internal successors, (59), 51 states have internal predecessors, (59), 14 states have call successors, (14), 11 states have call predecessors, (14), 9 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2021-05-03 00:37:05,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 85 transitions. [2021-05-03 00:37:05,747 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 85 transitions. Word has length 56 [2021-05-03 00:37:05,747 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:37:05,747 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 85 transitions. [2021-05-03 00:37:05,748 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 14 states have (on average 2.4285714285714284) internal successors, (34), 12 states have internal predecessors, (34), 5 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-05-03 00:37:05,748 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 85 transitions. [2021-05-03 00:37:05,748 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-05-03 00:37:05,749 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:37:05,749 INFO L523 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:37:05,749 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-05-03 00:37:05,749 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:37:05,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:37:05,749 INFO L82 PathProgramCache]: Analyzing trace with hash 1653895387, now seen corresponding path program 1 times [2021-05-03 00:37:05,750 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:37:05,750 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1304978996] [2021-05-03 00:37:05,750 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:37:05,752 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:37:05,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:05,806 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:37:05,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:05,812 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:37:05,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:05,814 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:37:05,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:05,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:37:05,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:05,822 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:37:05,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:05,827 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:37:05,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:05,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-03 00:37:05,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:05,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-05-03 00:37:05,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:05,960 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:37:05,960 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:37:05,960 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1304978996] [2021-05-03 00:37:05,960 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1304978996] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:37:05,960 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:37:05,961 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-03 00:37:05,961 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956194082] [2021-05-03 00:37:05,961 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-03 00:37:05,961 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:37:05,961 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-03 00:37:05,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-05-03 00:37:05,962 INFO L87 Difference]: Start difference. First operand 74 states and 85 transitions. Second operand has 12 states, 11 states have (on average 3.272727272727273) internal successors, (36), 9 states have internal predecessors, (36), 3 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-03 00:37:06,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:37:06,652 INFO L93 Difference]: Finished difference Result 110 states and 129 transitions. [2021-05-03 00:37:06,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-03 00:37:06,655 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.272727272727273) internal successors, (36), 9 states have internal predecessors, (36), 3 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) Word has length 60 [2021-05-03 00:37:06,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:37:06,656 INFO L225 Difference]: With dead ends: 110 [2021-05-03 00:37:06,656 INFO L226 Difference]: Without dead ends: 90 [2021-05-03 00:37:06,657 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 400.5ms TimeCoverageRelationStatistics Valid=99, Invalid=363, Unknown=0, NotChecked=0, Total=462 [2021-05-03 00:37:06,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-05-03 00:37:06,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 83. [2021-05-03 00:37:06,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 56 states have (on average 1.1964285714285714) internal successors, (67), 59 states have internal predecessors, (67), 15 states have call successors, (15), 11 states have call predecessors, (15), 11 states have return successors, (15), 12 states have call predecessors, (15), 12 states have call successors, (15) [2021-05-03 00:37:06,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 97 transitions. [2021-05-03 00:37:06,670 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 97 transitions. Word has length 60 [2021-05-03 00:37:06,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:37:06,670 INFO L480 AbstractCegarLoop]: Abstraction has 83 states and 97 transitions. [2021-05-03 00:37:06,670 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 11 states have (on average 3.272727272727273) internal successors, (36), 9 states have internal predecessors, (36), 3 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-03 00:37:06,670 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 97 transitions. [2021-05-03 00:37:06,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2021-05-03 00:37:06,671 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:37:06,672 INFO L523 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:37:06,672 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-03 00:37:06,672 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:37:06,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:37:06,672 INFO L82 PathProgramCache]: Analyzing trace with hash 2146675487, now seen corresponding path program 1 times [2021-05-03 00:37:06,673 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:37:06,673 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1775793821] [2021-05-03 00:37:06,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:37:06,675 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:37:06,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:06,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:37:06,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:06,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:37:06,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:06,762 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:37:06,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:06,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:37:06,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:06,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:37:06,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:06,779 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:37:06,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:06,781 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-03 00:37:06,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:06,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2021-05-03 00:37:06,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:06,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2021-05-03 00:37:06,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:06,792 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:37:06,792 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:37:06,792 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1775793821] [2021-05-03 00:37:06,793 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1775793821] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:37:06,793 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:37:06,793 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-03 00:37:06,793 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636058098] [2021-05-03 00:37:06,793 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-03 00:37:06,793 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:37:06,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-03 00:37:06,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2021-05-03 00:37:06,794 INFO L87 Difference]: Start difference. First operand 83 states and 97 transitions. Second operand has 10 states, 10 states have (on average 3.8) internal successors, (38), 7 states have internal predecessors, (38), 4 states have call successors, (12), 5 states have call predecessors, (12), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-03 00:37:07,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:37:07,212 INFO L93 Difference]: Finished difference Result 114 states and 138 transitions. [2021-05-03 00:37:07,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-03 00:37:07,213 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 7 states have internal predecessors, (38), 4 states have call successors, (12), 5 states have call predecessors, (12), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 64 [2021-05-03 00:37:07,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:37:07,217 INFO L225 Difference]: With dead ends: 114 [2021-05-03 00:37:07,217 INFO L226 Difference]: Without dead ends: 93 [2021-05-03 00:37:07,218 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 154.0ms TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2021-05-03 00:37:07,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-05-03 00:37:07,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 92. [2021-05-03 00:37:07,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 61 states have (on average 1.1967213114754098) internal successors, (73), 65 states have internal predecessors, (73), 19 states have call successors, (19), 12 states have call predecessors, (19), 11 states have return successors, (17), 14 states have call predecessors, (17), 14 states have call successors, (17) [2021-05-03 00:37:07,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 109 transitions. [2021-05-03 00:37:07,255 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 109 transitions. Word has length 64 [2021-05-03 00:37:07,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:37:07,258 INFO L480 AbstractCegarLoop]: Abstraction has 92 states and 109 transitions. [2021-05-03 00:37:07,261 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 10 states have (on average 3.8) internal successors, (38), 7 states have internal predecessors, (38), 4 states have call successors, (12), 5 states have call predecessors, (12), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-03 00:37:07,261 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 109 transitions. [2021-05-03 00:37:07,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-05-03 00:37:07,265 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:37:07,265 INFO L523 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:37:07,265 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-05-03 00:37:07,265 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:37:07,266 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:37:07,266 INFO L82 PathProgramCache]: Analyzing trace with hash -1758641907, now seen corresponding path program 1 times [2021-05-03 00:37:07,266 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:37:07,266 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [244039231] [2021-05-03 00:37:07,266 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:37:07,268 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:37:07,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:07,344 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:37:07,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:07,354 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:37:07,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:07,358 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:37:07,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:07,362 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:37:07,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:07,376 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:37:07,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:07,385 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:37:07,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:07,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2021-05-03 00:37:07,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:07,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 48 [2021-05-03 00:37:07,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:07,435 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:37:07,436 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:37:07,436 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [244039231] [2021-05-03 00:37:07,436 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [244039231] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:37:07,436 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:37:07,436 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [] total 10 [2021-05-03 00:37:07,436 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2141880035] [2021-05-03 00:37:07,437 INFO L460 AbstractCegarLoop]: Interpolant automaton has 10 states [2021-05-03 00:37:07,437 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:37:07,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-05-03 00:37:07,438 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2021-05-03 00:37:07,438 INFO L87 Difference]: Start difference. First operand 92 states and 109 transitions. Second operand has 10 states, 9 states have (on average 4.333333333333333) internal successors, (39), 8 states have internal predecessors, (39), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-03 00:37:07,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:37:07,788 INFO L93 Difference]: Finished difference Result 108 states and 125 transitions. [2021-05-03 00:37:07,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-03 00:37:07,788 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 9 states have (on average 4.333333333333333) internal successors, (39), 8 states have internal predecessors, (39), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) Word has length 63 [2021-05-03 00:37:07,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:37:07,790 INFO L225 Difference]: With dead ends: 108 [2021-05-03 00:37:07,790 INFO L226 Difference]: Without dead ends: 86 [2021-05-03 00:37:07,790 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 139.6ms TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2021-05-03 00:37:07,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-05-03 00:37:07,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2021-05-03 00:37:07,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 58 states have (on average 1.1896551724137931) internal successors, (69), 61 states have internal predecessors, (69), 15 states have call successors, (15), 11 states have call predecessors, (15), 11 states have return successors, (15), 12 states have call predecessors, (15), 12 states have call successors, (15) [2021-05-03 00:37:07,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 99 transitions. [2021-05-03 00:37:07,803 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 99 transitions. Word has length 63 [2021-05-03 00:37:07,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:37:07,803 INFO L480 AbstractCegarLoop]: Abstraction has 85 states and 99 transitions. [2021-05-03 00:37:07,803 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 10 states, 9 states have (on average 4.333333333333333) internal successors, (39), 8 states have internal predecessors, (39), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-03 00:37:07,803 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 99 transitions. [2021-05-03 00:37:07,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-03 00:37:07,804 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:37:07,804 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:37:07,804 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-05-03 00:37:07,804 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:37:07,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:37:07,805 INFO L82 PathProgramCache]: Analyzing trace with hash 1958796481, now seen corresponding path program 2 times [2021-05-03 00:37:07,805 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:37:07,805 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1457119175] [2021-05-03 00:37:07,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:37:07,806 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:37:07,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:07,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:37:07,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:07,855 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:37:07,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:07,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:37:07,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:07,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:37:07,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:07,871 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:37:07,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:07,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:37:07,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:07,875 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-05-03 00:37:07,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:07,897 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 46 [2021-05-03 00:37:07,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:07,900 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 54 [2021-05-03 00:37:07,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:07,902 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:37:07,902 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:37:07,902 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1457119175] [2021-05-03 00:37:07,903 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1457119175] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:37:07,903 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:37:07,903 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-05-03 00:37:07,903 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254977742] [2021-05-03 00:37:07,903 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-05-03 00:37:07,903 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:37:07,903 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-05-03 00:37:07,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2021-05-03 00:37:07,904 INFO L87 Difference]: Start difference. First operand 85 states and 99 transitions. Second operand has 9 states, 9 states have (on average 4.333333333333333) internal successors, (39), 7 states have internal predecessors, (39), 3 states have call successors, (12), 4 states have call predecessors, (12), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-03 00:37:08,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:37:08,236 INFO L93 Difference]: Finished difference Result 116 states and 133 transitions. [2021-05-03 00:37:08,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-03 00:37:08,236 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 4.333333333333333) internal successors, (39), 7 states have internal predecessors, (39), 3 states have call successors, (12), 4 states have call predecessors, (12), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) Word has length 66 [2021-05-03 00:37:08,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:37:08,237 INFO L225 Difference]: With dead ends: 116 [2021-05-03 00:37:08,237 INFO L226 Difference]: Without dead ends: 82 [2021-05-03 00:37:08,238 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 136.5ms TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-05-03 00:37:08,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2021-05-03 00:37:08,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 78. [2021-05-03 00:37:08,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 54 states have (on average 1.1666666666666667) internal successors, (63), 55 states have internal predecessors, (63), 14 states have call successors, (14), 11 states have call predecessors, (14), 9 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2021-05-03 00:37:08,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 89 transitions. [2021-05-03 00:37:08,249 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 89 transitions. Word has length 66 [2021-05-03 00:37:08,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:37:08,249 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 89 transitions. [2021-05-03 00:37:08,249 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 9 states, 9 states have (on average 4.333333333333333) internal successors, (39), 7 states have internal predecessors, (39), 3 states have call successors, (12), 4 states have call predecessors, (12), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-03 00:37:08,249 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 89 transitions. [2021-05-03 00:37:08,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-05-03 00:37:08,250 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:37:08,250 INFO L523 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:37:08,250 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-05-03 00:37:08,250 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:37:08,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:37:08,251 INFO L82 PathProgramCache]: Analyzing trace with hash 1560433451, now seen corresponding path program 2 times [2021-05-03 00:37:08,251 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:37:08,251 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1950068331] [2021-05-03 00:37:08,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:37:08,253 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:37:08,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:08,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:37:08,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:08,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:37:08,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:08,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:37:08,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:08,345 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:37:08,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:08,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:37:08,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:08,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:37:08,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:08,356 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-05-03 00:37:08,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:08,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-05-03 00:37:08,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:08,402 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:37:08,403 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:37:08,403 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1950068331] [2021-05-03 00:37:08,403 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1950068331] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:37:08,403 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:37:08,403 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-03 00:37:08,403 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1776479432] [2021-05-03 00:37:08,404 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-03 00:37:08,404 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:37:08,404 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-03 00:37:08,404 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2021-05-03 00:37:08,405 INFO L87 Difference]: Start difference. First operand 78 states and 89 transitions. Second operand has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 10 states have internal predecessors, (41), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-03 00:37:08,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:37:08,884 INFO L93 Difference]: Finished difference Result 107 states and 123 transitions. [2021-05-03 00:37:08,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-03 00:37:08,884 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 10 states have internal predecessors, (41), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) Word has length 65 [2021-05-03 00:37:08,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:37:08,885 INFO L225 Difference]: With dead ends: 107 [2021-05-03 00:37:08,885 INFO L226 Difference]: Without dead ends: 85 [2021-05-03 00:37:08,886 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 257.4ms TimeCoverageRelationStatistics Valid=82, Invalid=338, Unknown=0, NotChecked=0, Total=420 [2021-05-03 00:37:08,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-05-03 00:37:08,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 80. [2021-05-03 00:37:08,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 56 states have (on average 1.1785714285714286) internal successors, (66), 57 states have internal predecessors, (66), 14 states have call successors, (14), 11 states have call predecessors, (14), 9 states have return successors, (12), 11 states have call predecessors, (12), 11 states have call successors, (12) [2021-05-03 00:37:08,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 92 transitions. [2021-05-03 00:37:08,895 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 92 transitions. Word has length 65 [2021-05-03 00:37:08,896 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:37:08,896 INFO L480 AbstractCegarLoop]: Abstraction has 80 states and 92 transitions. [2021-05-03 00:37:08,896 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.4166666666666665) internal successors, (41), 10 states have internal predecessors, (41), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-03 00:37:08,896 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 92 transitions. [2021-05-03 00:37:08,897 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-05-03 00:37:08,897 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:37:08,897 INFO L523 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:37:08,897 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-05-03 00:37:08,897 INFO L428 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:37:08,897 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:37:08,897 INFO L82 PathProgramCache]: Analyzing trace with hash -1084413588, now seen corresponding path program 1 times [2021-05-03 00:37:08,898 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:37:08,898 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [264236685] [2021-05-03 00:37:08,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:37:08,899 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:37:08,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:09,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:37:09,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:09,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:37:09,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:09,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:37:09,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:09,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:37:09,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:09,401 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:37:09,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:09,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:37:09,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:09,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-05-03 00:37:09,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:09,541 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-05-03 00:37:09,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:10,580 WARN L205 SmtUtils]: Spent 320.00 ms on a formula simplification. DAG size of input: 92 DAG size of output: 53 [2021-05-03 00:37:10,639 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-03 00:37:10,640 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:37:10,640 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [264236685] [2021-05-03 00:37:10,640 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [264236685] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:37:10,640 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:37:10,640 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [] total 25 [2021-05-03 00:37:10,640 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744769880] [2021-05-03 00:37:10,641 INFO L460 AbstractCegarLoop]: Interpolant automaton has 25 states [2021-05-03 00:37:10,641 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:37:10,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-05-03 00:37:10,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=535, Unknown=0, NotChecked=0, Total=600 [2021-05-03 00:37:10,641 INFO L87 Difference]: Start difference. First operand 80 states and 92 transitions. Second operand has 25 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 19 states have internal predecessors, (44), 7 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-05-03 00:37:12,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:37:12,943 INFO L93 Difference]: Finished difference Result 122 states and 147 transitions. [2021-05-03 00:37:12,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-05-03 00:37:12,943 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 19 states have internal predecessors, (44), 7 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 66 [2021-05-03 00:37:12,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:37:12,945 INFO L225 Difference]: With dead ends: 122 [2021-05-03 00:37:12,945 INFO L226 Difference]: Without dead ends: 120 [2021-05-03 00:37:12,946 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 2321.8ms TimeCoverageRelationStatistics Valid=296, Invalid=1960, Unknown=0, NotChecked=0, Total=2256 [2021-05-03 00:37:12,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-05-03 00:37:12,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 93. [2021-05-03 00:37:12,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 66 states have (on average 1.2121212121212122) internal successors, (80), 69 states have internal predecessors, (80), 16 states have call successors, (16), 11 states have call predecessors, (16), 10 states have return successors, (18), 12 states have call predecessors, (18), 13 states have call successors, (18) [2021-05-03 00:37:12,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 114 transitions. [2021-05-03 00:37:12,960 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 114 transitions. Word has length 66 [2021-05-03 00:37:12,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:37:12,960 INFO L480 AbstractCegarLoop]: Abstraction has 93 states and 114 transitions. [2021-05-03 00:37:12,960 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 25 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 19 states have internal predecessors, (44), 7 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-05-03 00:37:12,960 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 114 transitions. [2021-05-03 00:37:12,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-05-03 00:37:12,961 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:37:12,961 INFO L523 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:37:12,961 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-05-03 00:37:12,961 INFO L428 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:37:12,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:37:12,962 INFO L82 PathProgramCache]: Analyzing trace with hash -1470293173, now seen corresponding path program 2 times [2021-05-03 00:37:12,962 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:37:12,962 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1207377884] [2021-05-03 00:37:12,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:37:12,964 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:37:12,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:13,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:37:13,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:13,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:37:13,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:13,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:37:13,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:13,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:37:13,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:13,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:37:13,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:13,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:37:13,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:13,035 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-05-03 00:37:13,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:13,038 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-05-03 00:37:13,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:13,075 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:37:13,076 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:37:13,076 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1207377884] [2021-05-03 00:37:13,076 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1207377884] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:37:13,076 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:37:13,076 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-03 00:37:13,076 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249893529] [2021-05-03 00:37:13,077 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-03 00:37:13,079 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:37:13,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-03 00:37:13,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2021-05-03 00:37:13,080 INFO L87 Difference]: Start difference. First operand 93 states and 114 transitions. Second operand has 12 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 10 states have internal predecessors, (43), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-03 00:37:13,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:37:13,660 INFO L93 Difference]: Finished difference Result 127 states and 157 transitions. [2021-05-03 00:37:13,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-03 00:37:13,660 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 10 states have internal predecessors, (43), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) Word has length 67 [2021-05-03 00:37:13,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:37:13,662 INFO L225 Difference]: With dead ends: 127 [2021-05-03 00:37:13,662 INFO L226 Difference]: Without dead ends: 107 [2021-05-03 00:37:13,662 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 248.4ms TimeCoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2021-05-03 00:37:13,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2021-05-03 00:37:13,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 103. [2021-05-03 00:37:13,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 74 states have (on average 1.2297297297297298) internal successors, (91), 78 states have internal predecessors, (91), 17 states have call successors, (17), 11 states have call predecessors, (17), 11 states have return successors, (22), 13 states have call predecessors, (22), 14 states have call successors, (22) [2021-05-03 00:37:13,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 130 transitions. [2021-05-03 00:37:13,677 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 130 transitions. Word has length 67 [2021-05-03 00:37:13,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:37:13,678 INFO L480 AbstractCegarLoop]: Abstraction has 103 states and 130 transitions. [2021-05-03 00:37:13,678 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.5833333333333335) internal successors, (43), 10 states have internal predecessors, (43), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-03 00:37:13,678 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 130 transitions. [2021-05-03 00:37:13,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-05-03 00:37:13,679 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:37:13,679 INFO L523 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:37:13,679 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-05-03 00:37:13,679 INFO L428 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:37:13,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:37:13,679 INFO L82 PathProgramCache]: Analyzing trace with hash -1247511922, now seen corresponding path program 3 times [2021-05-03 00:37:13,679 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:37:13,680 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [645002156] [2021-05-03 00:37:13,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:37:13,681 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:37:13,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:13,733 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:37:13,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:13,738 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:37:13,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:13,740 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:37:13,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:13,742 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:37:13,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:13,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:37:13,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:13,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:37:13,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:13,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-05-03 00:37:13,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:13,814 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2021-05-03 00:37:13,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:13,820 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:37:13,820 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:37:13,821 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [645002156] [2021-05-03 00:37:13,821 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [645002156] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:37:13,821 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:37:13,821 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-03 00:37:13,821 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769771140] [2021-05-03 00:37:13,821 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-03 00:37:13,821 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:37:13,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-03 00:37:13,822 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=131, Unknown=0, NotChecked=0, Total=156 [2021-05-03 00:37:13,822 INFO L87 Difference]: Start difference. First operand 103 states and 130 transitions. Second operand has 13 states, 13 states have (on average 3.3846153846153846) internal successors, (44), 11 states have internal predecessors, (44), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-03 00:37:14,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:37:14,520 INFO L93 Difference]: Finished difference Result 169 states and 215 transitions. [2021-05-03 00:37:14,520 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-05-03 00:37:14,520 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.3846153846153846) internal successors, (44), 11 states have internal predecessors, (44), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) Word has length 68 [2021-05-03 00:37:14,521 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:37:14,522 INFO L225 Difference]: With dead ends: 169 [2021-05-03 00:37:14,522 INFO L226 Difference]: Without dead ends: 120 [2021-05-03 00:37:14,523 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 413.9ms TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2021-05-03 00:37:14,523 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-05-03 00:37:14,541 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 109. [2021-05-03 00:37:14,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 80 states have (on average 1.2625) internal successors, (101), 85 states have internal predecessors, (101), 16 states have call successors, (16), 11 states have call predecessors, (16), 12 states have return successors, (19), 12 states have call predecessors, (19), 13 states have call successors, (19) [2021-05-03 00:37:14,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 136 transitions. [2021-05-03 00:37:14,543 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 136 transitions. Word has length 68 [2021-05-03 00:37:14,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:37:14,543 INFO L480 AbstractCegarLoop]: Abstraction has 109 states and 136 transitions. [2021-05-03 00:37:14,544 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.3846153846153846) internal successors, (44), 11 states have internal predecessors, (44), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-03 00:37:14,544 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 136 transitions. [2021-05-03 00:37:14,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-05-03 00:37:14,544 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:37:14,544 INFO L523 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:37:14,545 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-05-03 00:37:14,545 INFO L428 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:37:14,545 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:37:14,545 INFO L82 PathProgramCache]: Analyzing trace with hash -677053431, now seen corresponding path program 4 times [2021-05-03 00:37:14,545 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:37:14,545 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [823729607] [2021-05-03 00:37:14,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:37:14,547 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:37:14,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:14,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:37:14,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:14,600 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:37:14,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:14,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:37:14,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:14,603 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:37:14,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:14,610 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:37:14,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:14,612 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:37:14,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:14,614 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-05-03 00:37:14,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:14,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 53 [2021-05-03 00:37:14,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:14,668 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:37:14,668 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:37:14,668 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [823729607] [2021-05-03 00:37:14,668 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [823729607] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:37:14,668 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:37:14,668 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [11] imperfect sequences [] total 11 [2021-05-03 00:37:14,669 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1057141668] [2021-05-03 00:37:14,669 INFO L460 AbstractCegarLoop]: Interpolant automaton has 11 states [2021-05-03 00:37:14,670 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:37:14,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-05-03 00:37:14,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2021-05-03 00:37:14,670 INFO L87 Difference]: Start difference. First operand 109 states and 136 transitions. Second operand has 11 states, 11 states have (on average 4.0) internal successors, (44), 9 states have internal predecessors, (44), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-03 00:37:15,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:37:15,097 INFO L93 Difference]: Finished difference Result 171 states and 215 transitions. [2021-05-03 00:37:15,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-03 00:37:15,098 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 4.0) internal successors, (44), 9 states have internal predecessors, (44), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) Word has length 69 [2021-05-03 00:37:15,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:37:15,099 INFO L225 Difference]: With dead ends: 171 [2021-05-03 00:37:15,099 INFO L226 Difference]: Without dead ends: 132 [2021-05-03 00:37:15,100 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 208.9ms TimeCoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2021-05-03 00:37:15,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-05-03 00:37:15,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 112. [2021-05-03 00:37:15,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 83 states have (on average 1.2771084337349397) internal successors, (106), 88 states have internal predecessors, (106), 16 states have call successors, (16), 11 states have call predecessors, (16), 12 states have return successors, (19), 12 states have call predecessors, (19), 13 states have call successors, (19) [2021-05-03 00:37:15,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 141 transitions. [2021-05-03 00:37:15,128 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 141 transitions. Word has length 69 [2021-05-03 00:37:15,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:37:15,129 INFO L480 AbstractCegarLoop]: Abstraction has 112 states and 141 transitions. [2021-05-03 00:37:15,129 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 11 states, 11 states have (on average 4.0) internal successors, (44), 9 states have internal predecessors, (44), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-03 00:37:15,129 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 141 transitions. [2021-05-03 00:37:15,130 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-05-03 00:37:15,130 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:37:15,130 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:37:15,130 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-05-03 00:37:15,130 INFO L428 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:37:15,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:37:15,131 INFO L82 PathProgramCache]: Analyzing trace with hash -1405616165, now seen corresponding path program 5 times [2021-05-03 00:37:15,131 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:37:15,131 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1435673659] [2021-05-03 00:37:15,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:37:15,136 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:37:15,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:15,214 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:37:15,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:15,219 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:37:15,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:15,221 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:37:15,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:15,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:37:15,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:15,231 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:37:15,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:15,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:37:15,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:15,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-05-03 00:37:15,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:15,237 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-05-03 00:37:15,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:15,291 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:37:15,292 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:37:15,292 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1435673659] [2021-05-03 00:37:15,292 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1435673659] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:37:15,292 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:37:15,292 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-03 00:37:15,292 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [756620343] [2021-05-03 00:37:15,293 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-03 00:37:15,293 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:37:15,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-03 00:37:15,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2021-05-03 00:37:15,294 INFO L87 Difference]: Start difference. First operand 112 states and 141 transitions. Second operand has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 11 states have internal predecessors, (46), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-03 00:37:15,848 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:37:15,848 INFO L93 Difference]: Finished difference Result 138 states and 169 transitions. [2021-05-03 00:37:15,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-03 00:37:15,849 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 11 states have internal predecessors, (46), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) Word has length 70 [2021-05-03 00:37:15,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:37:15,850 INFO L225 Difference]: With dead ends: 138 [2021-05-03 00:37:15,850 INFO L226 Difference]: Without dead ends: 118 [2021-05-03 00:37:15,851 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 281.2ms TimeCoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2021-05-03 00:37:15,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-05-03 00:37:15,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 96. [2021-05-03 00:37:15,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 70 states have (on average 1.2571428571428571) internal successors, (88), 73 states have internal predecessors, (88), 15 states have call successors, (15), 11 states have call predecessors, (15), 10 states have return successors, (14), 11 states have call predecessors, (14), 12 states have call successors, (14) [2021-05-03 00:37:15,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 117 transitions. [2021-05-03 00:37:15,865 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 117 transitions. Word has length 70 [2021-05-03 00:37:15,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:37:15,865 INFO L480 AbstractCegarLoop]: Abstraction has 96 states and 117 transitions. [2021-05-03 00:37:15,865 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.5384615384615383) internal successors, (46), 11 states have internal predecessors, (46), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-03 00:37:15,866 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 117 transitions. [2021-05-03 00:37:15,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-03 00:37:15,867 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:37:15,867 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:37:15,867 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-05-03 00:37:15,867 INFO L428 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:37:15,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:37:15,868 INFO L82 PathProgramCache]: Analyzing trace with hash 875388352, now seen corresponding path program 1 times [2021-05-03 00:37:15,868 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:37:15,868 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2009241874] [2021-05-03 00:37:15,868 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:37:15,869 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:37:15,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:15,937 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:37:15,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:15,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:37:15,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:15,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:37:15,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:15,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:37:15,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:15,949 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:37:15,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:15,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:37:15,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:15,952 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-05-03 00:37:15,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:15,966 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 49 [2021-05-03 00:37:15,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:15,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2021-05-03 00:37:15,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:15,979 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:37:15,979 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:37:15,979 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2009241874] [2021-05-03 00:37:15,979 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2009241874] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:37:15,979 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:37:15,979 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-05-03 00:37:15,979 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965408722] [2021-05-03 00:37:15,980 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-05-03 00:37:15,980 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:37:15,980 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-05-03 00:37:15,980 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-05-03 00:37:15,980 INFO L87 Difference]: Start difference. First operand 96 states and 117 transitions. Second operand has 8 states, 8 states have (on average 5.75) internal successors, (46), 6 states have internal predecessors, (46), 3 states have call successors, (12), 4 states have call predecessors, (12), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-03 00:37:16,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:37:16,195 INFO L93 Difference]: Finished difference Result 151 states and 186 transitions. [2021-05-03 00:37:16,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-05-03 00:37:16,196 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.75) internal successors, (46), 6 states have internal predecessors, (46), 3 states have call successors, (12), 4 states have call predecessors, (12), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) Word has length 73 [2021-05-03 00:37:16,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:37:16,196 INFO L225 Difference]: With dead ends: 151 [2021-05-03 00:37:16,197 INFO L226 Difference]: Without dead ends: 98 [2021-05-03 00:37:16,197 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 78.8ms TimeCoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2021-05-03 00:37:16,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-05-03 00:37:16,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2021-05-03 00:37:16,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 72 states have (on average 1.2361111111111112) internal successors, (89), 75 states have internal predecessors, (89), 15 states have call successors, (15), 11 states have call predecessors, (15), 10 states have return successors, (14), 11 states have call predecessors, (14), 12 states have call successors, (14) [2021-05-03 00:37:16,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 118 transitions. [2021-05-03 00:37:16,213 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 118 transitions. Word has length 73 [2021-05-03 00:37:16,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:37:16,213 INFO L480 AbstractCegarLoop]: Abstraction has 98 states and 118 transitions. [2021-05-03 00:37:16,214 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 8 states have (on average 5.75) internal successors, (46), 6 states have internal predecessors, (46), 3 states have call successors, (12), 4 states have call predecessors, (12), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-03 00:37:16,214 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 118 transitions. [2021-05-03 00:37:16,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-05-03 00:37:16,215 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:37:16,215 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:37:16,215 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-05-03 00:37:16,215 INFO L428 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:37:16,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:37:16,216 INFO L82 PathProgramCache]: Analyzing trace with hash -495926943, now seen corresponding path program 1 times [2021-05-03 00:37:16,216 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:37:16,216 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1213277229] [2021-05-03 00:37:16,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:37:16,217 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:37:16,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:16,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:37:16,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:16,338 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:37:16,339 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:16,340 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:37:16,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:16,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:37:16,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:16,423 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:37:16,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:16,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:37:16,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:16,429 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 39 [2021-05-03 00:37:16,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:16,431 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 50 [2021-05-03 00:37:16,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:16,435 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 62 [2021-05-03 00:37:16,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:16,436 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:37:16,436 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:37:16,436 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1213277229] [2021-05-03 00:37:16,436 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1213277229] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:37:16,437 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:37:16,437 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-03 00:37:16,437 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [77882616] [2021-05-03 00:37:16,437 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-03 00:37:16,437 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:37:16,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-03 00:37:16,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-05-03 00:37:16,438 INFO L87 Difference]: Start difference. First operand 98 states and 118 transitions. Second operand has 12 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 10 states have internal predecessors, (47), 3 states have call successors, (12), 4 states have call predecessors, (12), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-03 00:37:16,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:37:16,906 INFO L93 Difference]: Finished difference Result 179 states and 220 transitions. [2021-05-03 00:37:16,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-03 00:37:16,907 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 10 states have internal predecessors, (47), 3 states have call successors, (12), 4 states have call predecessors, (12), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 74 [2021-05-03 00:37:16,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:37:16,909 INFO L225 Difference]: With dead ends: 179 [2021-05-03 00:37:16,909 INFO L226 Difference]: Without dead ends: 120 [2021-05-03 00:37:16,911 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 263.6ms TimeCoverageRelationStatistics Valid=78, Invalid=342, Unknown=0, NotChecked=0, Total=420 [2021-05-03 00:37:16,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-05-03 00:37:16,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 114. [2021-05-03 00:37:16,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 114 states, 84 states have (on average 1.2142857142857142) internal successors, (102), 87 states have internal predecessors, (102), 18 states have call successors, (18), 11 states have call predecessors, (18), 11 states have return successors, (18), 15 states have call predecessors, (18), 15 states have call successors, (18) [2021-05-03 00:37:16,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 138 transitions. [2021-05-03 00:37:16,932 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 138 transitions. Word has length 74 [2021-05-03 00:37:16,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:37:16,932 INFO L480 AbstractCegarLoop]: Abstraction has 114 states and 138 transitions. [2021-05-03 00:37:16,932 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 3.9166666666666665) internal successors, (47), 10 states have internal predecessors, (47), 3 states have call successors, (12), 4 states have call predecessors, (12), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-03 00:37:16,933 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 138 transitions. [2021-05-03 00:37:16,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2021-05-03 00:37:16,933 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:37:16,933 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:37:16,933 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-05-03 00:37:16,933 INFO L428 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:37:16,934 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:37:16,934 INFO L82 PathProgramCache]: Analyzing trace with hash -1541127366, now seen corresponding path program 6 times [2021-05-03 00:37:16,934 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:37:16,934 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2091181275] [2021-05-03 00:37:16,934 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:37:16,935 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:37:16,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:16,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:37:16,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:16,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:37:16,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:16,987 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:37:16,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:16,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:37:16,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:16,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:37:16,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:16,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:37:16,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:16,998 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-05-03 00:37:17,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:17,030 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2021-05-03 00:37:17,033 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:17,106 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:37:17,106 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:37:17,106 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2091181275] [2021-05-03 00:37:17,106 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2091181275] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:37:17,106 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:37:17,106 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-03 00:37:17,106 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056202065] [2021-05-03 00:37:17,107 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-03 00:37:17,107 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:37:17,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-03 00:37:17,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2021-05-03 00:37:17,107 INFO L87 Difference]: Start difference. First operand 114 states and 138 transitions. Second operand has 13 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 10 states have internal predecessors, (44), 3 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-03 00:37:17,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:37:17,692 INFO L93 Difference]: Finished difference Result 170 states and 209 transitions. [2021-05-03 00:37:17,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-05-03 00:37:17,693 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 10 states have internal predecessors, (44), 3 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) Word has length 73 [2021-05-03 00:37:17,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:37:17,695 INFO L225 Difference]: With dead ends: 170 [2021-05-03 00:37:17,695 INFO L226 Difference]: Without dead ends: 148 [2021-05-03 00:37:17,696 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 344.5ms TimeCoverageRelationStatistics Valid=86, Invalid=420, Unknown=0, NotChecked=0, Total=506 [2021-05-03 00:37:17,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-05-03 00:37:17,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 129. [2021-05-03 00:37:17,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 96 states have (on average 1.2395833333333333) internal successors, (119), 101 states have internal predecessors, (119), 19 states have call successors, (19), 11 states have call predecessors, (19), 13 states have return successors, (21), 16 states have call predecessors, (21), 16 states have call successors, (21) [2021-05-03 00:37:17,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 159 transitions. [2021-05-03 00:37:17,717 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 159 transitions. Word has length 73 [2021-05-03 00:37:17,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:37:17,717 INFO L480 AbstractCegarLoop]: Abstraction has 129 states and 159 transitions. [2021-05-03 00:37:17,717 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 3.6666666666666665) internal successors, (44), 10 states have internal predecessors, (44), 3 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-03 00:37:17,717 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 159 transitions. [2021-05-03 00:37:17,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-05-03 00:37:17,718 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:37:17,718 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:37:17,718 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-05-03 00:37:17,718 INFO L428 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:37:17,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:37:17,719 INFO L82 PathProgramCache]: Analyzing trace with hash -1213658525, now seen corresponding path program 1 times [2021-05-03 00:37:17,719 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:37:17,719 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1459871315] [2021-05-03 00:37:17,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:37:17,747 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2021-05-03 00:37:17,749 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:37:17,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:18,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:37:18,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:18,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:37:18,671 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:18,672 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:37:18,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:18,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-05-03 00:37:18,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:18,697 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-05-03 00:37:18,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:18,726 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-05-03 00:37:18,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:18,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-05-03 00:37:18,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:19,017 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-05-03 00:37:19,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:19,262 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 67 [2021-05-03 00:37:19,489 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 113 DAG size of output: 84 [2021-05-03 00:37:19,797 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2021-05-03 00:37:19,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:19,806 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-03 00:37:19,806 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:37:19,806 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1459871315] [2021-05-03 00:37:19,806 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1459871315] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:37:19,806 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:37:19,807 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [] total 35 [2021-05-03 00:37:19,807 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1905026745] [2021-05-03 00:37:19,807 INFO L460 AbstractCegarLoop]: Interpolant automaton has 35 states [2021-05-03 00:37:19,807 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:37:19,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-05-03 00:37:19,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=1112, Unknown=0, NotChecked=0, Total=1190 [2021-05-03 00:37:19,808 INFO L87 Difference]: Start difference. First operand 129 states and 159 transitions. Second operand has 35 states, 29 states have (on average 1.7586206896551724) internal successors, (51), 27 states have internal predecessors, (51), 8 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2021-05-03 00:37:22,306 WARN L205 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 137 DAG size of output: 132 [2021-05-03 00:37:23,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:37:23,555 INFO L93 Difference]: Finished difference Result 159 states and 194 transitions. [2021-05-03 00:37:23,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-05-03 00:37:23,555 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 29 states have (on average 1.7586206896551724) internal successors, (51), 27 states have internal predecessors, (51), 8 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) Word has length 75 [2021-05-03 00:37:23,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:37:23,557 INFO L225 Difference]: With dead ends: 159 [2021-05-03 00:37:23,557 INFO L226 Difference]: Without dead ends: 157 [2021-05-03 00:37:23,558 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 624 ImplicationChecksByTransitivity, 3700.6ms TimeCoverageRelationStatistics Valid=279, Invalid=3753, Unknown=0, NotChecked=0, Total=4032 [2021-05-03 00:37:23,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-05-03 00:37:23,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 146. [2021-05-03 00:37:23,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 107 states have (on average 1.2149532710280373) internal successors, (130), 113 states have internal predecessors, (130), 23 states have call successors, (23), 13 states have call predecessors, (23), 15 states have return successors, (26), 19 states have call predecessors, (26), 19 states have call successors, (26) [2021-05-03 00:37:23,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 179 transitions. [2021-05-03 00:37:23,582 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 179 transitions. Word has length 75 [2021-05-03 00:37:23,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:37:23,582 INFO L480 AbstractCegarLoop]: Abstraction has 146 states and 179 transitions. [2021-05-03 00:37:23,583 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 35 states, 29 states have (on average 1.7586206896551724) internal successors, (51), 27 states have internal predecessors, (51), 8 states have call successors, (12), 5 states have call predecessors, (12), 5 states have return successors, (9), 6 states have call predecessors, (9), 6 states have call successors, (9) [2021-05-03 00:37:23,583 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 179 transitions. [2021-05-03 00:37:23,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-03 00:37:23,584 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:37:23,584 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:37:23,584 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-05-03 00:37:23,584 INFO L428 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:37:23,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:37:23,585 INFO L82 PathProgramCache]: Analyzing trace with hash -831870690, now seen corresponding path program 2 times [2021-05-03 00:37:23,585 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:37:23,585 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [817601104] [2021-05-03 00:37:23,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:37:23,598 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2021-05-03 00:37:23,600 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:37:23,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:23,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:37:23,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:23,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:37:23,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:23,663 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:37:23,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:23,668 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-05-03 00:37:23,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:23,675 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-05-03 00:37:23,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:23,679 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-05-03 00:37:23,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:23,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-05-03 00:37:23,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:23,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2021-05-03 00:37:23,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:23,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 64 [2021-05-03 00:37:23,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:23,730 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:37:23,730 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:37:23,730 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [817601104] [2021-05-03 00:37:23,730 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [817601104] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:37:23,730 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:37:23,730 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-03 00:37:23,730 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059711275] [2021-05-03 00:37:23,731 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-03 00:37:23,731 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:37:23,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-03 00:37:23,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=130, Unknown=0, NotChecked=0, Total=156 [2021-05-03 00:37:23,731 INFO L87 Difference]: Start difference. First operand 146 states and 179 transitions. Second operand has 13 states, 12 states have (on average 4.083333333333333) internal successors, (49), 11 states have internal predecessors, (49), 3 states have call successors, (12), 4 states have call predecessors, (12), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-03 00:37:24,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:37:24,273 INFO L93 Difference]: Finished difference Result 208 states and 256 transitions. [2021-05-03 00:37:24,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-03 00:37:24,273 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 12 states have (on average 4.083333333333333) internal successors, (49), 11 states have internal predecessors, (49), 3 states have call successors, (12), 4 states have call predecessors, (12), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) Word has length 76 [2021-05-03 00:37:24,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:37:24,274 INFO L225 Difference]: With dead ends: 208 [2021-05-03 00:37:24,274 INFO L226 Difference]: Without dead ends: 148 [2021-05-03 00:37:24,275 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 278.8ms TimeCoverageRelationStatistics Valid=83, Invalid=337, Unknown=0, NotChecked=0, Total=420 [2021-05-03 00:37:24,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-05-03 00:37:24,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 144. [2021-05-03 00:37:24,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 107 states have (on average 1.2149532710280373) internal successors, (130), 112 states have internal predecessors, (130), 22 states have call successors, (22), 13 states have call predecessors, (22), 14 states have return successors, (23), 18 states have call predecessors, (23), 18 states have call successors, (23) [2021-05-03 00:37:24,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 175 transitions. [2021-05-03 00:37:24,295 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 175 transitions. Word has length 76 [2021-05-03 00:37:24,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:37:24,296 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 175 transitions. [2021-05-03 00:37:24,296 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 12 states have (on average 4.083333333333333) internal successors, (49), 11 states have internal predecessors, (49), 3 states have call successors, (12), 4 states have call predecessors, (12), 2 states have return successors, (9), 2 states have call predecessors, (9), 3 states have call successors, (9) [2021-05-03 00:37:24,296 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 175 transitions. [2021-05-03 00:37:24,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-05-03 00:37:24,297 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:37:24,297 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:37:24,297 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-05-03 00:37:24,297 INFO L428 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:37:24,297 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:37:24,297 INFO L82 PathProgramCache]: Analyzing trace with hash 1496849804, now seen corresponding path program 7 times [2021-05-03 00:37:24,297 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:37:24,297 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [121936789] [2021-05-03 00:37:24,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:37:24,299 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:37:24,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:25,005 WARN L205 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 48 [2021-05-03 00:37:25,236 WARN L205 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 43 [2021-05-03 00:37:25,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:37:25,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:25,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:37:25,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:25,386 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:37:25,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:25,388 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:37:25,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:25,413 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:37:25,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:25,441 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:37:25,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:25,471 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-05-03 00:37:25,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:26,210 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 38 [2021-05-03 00:37:26,409 WARN L205 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 39 [2021-05-03 00:37:26,694 WARN L205 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 22 [2021-05-03 00:37:26,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2021-05-03 00:37:27,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:37:35,780 WARN L205 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 76 [2021-05-03 00:37:36,227 WARN L205 SmtUtils]: Spent 434.00 ms on a formula simplification. DAG size of input: 986 DAG size of output: 447 [2021-05-03 00:38:06,389 WARN L205 SmtUtils]: Spent 25.48 s on a formula simplification. DAG size of input: 444 DAG size of output: 154 [2021-05-03 00:38:06,749 WARN L205 SmtUtils]: Spent 349.00 ms on a formula simplification. DAG size of input: 986 DAG size of output: 446 [2021-05-03 00:38:11,974 WARN L205 SmtUtils]: Spent 359.00 ms on a formula simplification. DAG size of input: 985 DAG size of output: 445 [2021-05-03 00:38:16,325 WARN L205 SmtUtils]: Spent 317.00 ms on a formula simplification. DAG size of input: 987 DAG size of output: 446 [2021-05-03 00:38:20,595 WARN L205 SmtUtils]: Spent 354.00 ms on a formula simplification. DAG size of input: 986 DAG size of output: 445 [2021-05-03 00:38:26,519 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-05-03 00:38:26,520 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:38:26,520 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [121936789] [2021-05-03 00:38:26,520 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [121936789] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:38:26,520 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:38:26,520 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [33] imperfect sequences [] total 33 [2021-05-03 00:38:26,520 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106115838] [2021-05-03 00:38:26,521 INFO L460 AbstractCegarLoop]: Interpolant automaton has 33 states [2021-05-03 00:38:26,522 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:38:26,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-05-03 00:38:26,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=969, Unknown=0, NotChecked=0, Total=1056 [2021-05-03 00:38:26,523 INFO L87 Difference]: Start difference. First operand 144 states and 175 transitions. Second operand has 33 states, 29 states have (on average 1.8620689655172413) internal successors, (54), 27 states have internal predecessors, (54), 7 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-05-03 00:38:33,997 WARN L205 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 81 DAG size of output: 73 [2021-05-03 00:38:35,286 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-03 00:38:39,876 WARN L205 SmtUtils]: Spent 2.64 s on a formula simplification. DAG size of input: 226 DAG size of output: 110 [2021-05-03 00:38:44,999 WARN L205 SmtUtils]: Spent 3.49 s on a formula simplification. DAG size of input: 270 DAG size of output: 147 [2021-05-03 00:38:54,685 WARN L205 SmtUtils]: Spent 8.06 s on a formula simplification that was a NOOP. DAG size: 184 [2021-05-03 00:38:58,671 WARN L205 SmtUtils]: Spent 1.96 s on a formula simplification. DAG size of input: 231 DAG size of output: 115 [2021-05-03 00:39:04,835 WARN L205 SmtUtils]: Spent 3.40 s on a formula simplification. DAG size of input: 274 DAG size of output: 151 [2021-05-03 00:39:20,152 WARN L205 SmtUtils]: Spent 11.74 s on a formula simplification that was a NOOP. DAG size: 201 [2021-05-03 00:39:33,886 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2021-05-03 00:39:38,636 WARN L205 SmtUtils]: Spent 294.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2021-05-03 00:39:39,488 WARN L205 SmtUtils]: Spent 374.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2021-05-03 00:39:40,371 WARN L205 SmtUtils]: Spent 362.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2021-05-03 00:39:41,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:39:41,550 INFO L93 Difference]: Finished difference Result 200 states and 255 transitions. [2021-05-03 00:39:41,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-05-03 00:39:41,554 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 29 states have (on average 1.8620689655172413) internal successors, (54), 27 states have internal predecessors, (54), 7 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 76 [2021-05-03 00:39:41,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:39:41,555 INFO L225 Difference]: With dead ends: 200 [2021-05-03 00:39:41,555 INFO L226 Difference]: Without dead ends: 198 [2021-05-03 00:39:41,557 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 22 SyntacticMatches, 5 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 714 ImplicationChecksByTransitivity, 100596.4ms TimeCoverageRelationStatistics Valid=422, Invalid=3868, Unknown=0, NotChecked=0, Total=4290 [2021-05-03 00:39:41,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2021-05-03 00:39:41,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 169. [2021-05-03 00:39:41,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 127 states have (on average 1.236220472440945) internal successors, (157), 134 states have internal predecessors, (157), 25 states have call successors, (25), 14 states have call predecessors, (25), 16 states have return successors, (33), 20 states have call predecessors, (33), 20 states have call successors, (33) [2021-05-03 00:39:41,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 215 transitions. [2021-05-03 00:39:41,590 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 215 transitions. Word has length 76 [2021-05-03 00:39:41,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:39:41,590 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 215 transitions. [2021-05-03 00:39:41,590 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 33 states, 29 states have (on average 1.8620689655172413) internal successors, (54), 27 states have internal predecessors, (54), 7 states have call successors, (11), 5 states have call predecessors, (11), 5 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-05-03 00:39:41,591 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 215 transitions. [2021-05-03 00:39:41,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-03 00:39:41,592 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:39:41,592 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:39:41,592 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-05-03 00:39:41,592 INFO L428 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:39:41,592 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:39:41,592 INFO L82 PathProgramCache]: Analyzing trace with hash 1239460651, now seen corresponding path program 8 times [2021-05-03 00:39:41,593 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:39:41,593 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1876887056] [2021-05-03 00:39:41,593 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:39:41,594 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:39:41,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:41,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:39:41,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:41,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:39:41,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:41,728 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:39:41,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:41,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:39:41,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:41,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:39:41,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:41,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:39:41,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:41,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-05-03 00:39:41,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:41,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2021-05-03 00:39:41,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:41,875 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:39:41,875 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:39:41,875 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1876887056] [2021-05-03 00:39:41,876 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1876887056] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:39:41,876 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:39:41,876 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [13] imperfect sequences [] total 13 [2021-05-03 00:39:41,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [699226043] [2021-05-03 00:39:41,876 INFO L460 AbstractCegarLoop]: Interpolant automaton has 13 states [2021-05-03 00:39:41,876 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:39:41,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-05-03 00:39:41,877 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2021-05-03 00:39:41,877 INFO L87 Difference]: Start difference. First operand 169 states and 215 transitions. Second operand has 13 states, 13 states have (on average 3.6923076923076925) internal successors, (48), 11 states have internal predecessors, (48), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-03 00:39:43,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:39:43,591 INFO L93 Difference]: Finished difference Result 196 states and 251 transitions. [2021-05-03 00:39:43,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-03 00:39:43,596 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 3.6923076923076925) internal successors, (48), 11 states have internal predecessors, (48), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) Word has length 77 [2021-05-03 00:39:43,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:39:43,597 INFO L225 Difference]: With dead ends: 196 [2021-05-03 00:39:43,597 INFO L226 Difference]: Without dead ends: 184 [2021-05-03 00:39:43,598 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 714.7ms TimeCoverageRelationStatistics Valid=96, Invalid=410, Unknown=0, NotChecked=0, Total=506 [2021-05-03 00:39:43,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2021-05-03 00:39:43,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 179. [2021-05-03 00:39:43,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 135 states have (on average 1.2444444444444445) internal successors, (168), 143 states have internal predecessors, (168), 26 states have call successors, (26), 14 states have call predecessors, (26), 17 states have return successors, (37), 21 states have call predecessors, (37), 21 states have call successors, (37) [2021-05-03 00:39:43,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 231 transitions. [2021-05-03 00:39:43,636 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 231 transitions. Word has length 77 [2021-05-03 00:39:43,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:39:43,636 INFO L480 AbstractCegarLoop]: Abstraction has 179 states and 231 transitions. [2021-05-03 00:39:43,637 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 13 states, 13 states have (on average 3.6923076923076925) internal successors, (48), 11 states have internal predecessors, (48), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-03 00:39:43,637 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 231 transitions. [2021-05-03 00:39:43,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-03 00:39:43,638 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:39:43,638 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:39:43,638 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-05-03 00:39:43,638 INFO L428 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:39:43,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:39:43,638 INFO L82 PathProgramCache]: Analyzing trace with hash 1092715177, now seen corresponding path program 9 times [2021-05-03 00:39:43,639 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:39:43,639 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1124650539] [2021-05-03 00:39:43,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:39:43,640 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:39:43,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:43,781 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:39:43,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:43,786 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:39:43,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:43,791 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:39:43,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:43,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:39:43,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:43,821 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:39:43,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:43,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:39:43,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:43,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-05-03 00:39:43,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:43,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2021-05-03 00:39:43,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:44,029 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:39:44,029 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:39:44,029 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1124650539] [2021-05-03 00:39:44,029 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1124650539] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:39:44,029 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:39:44,029 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-03 00:39:44,030 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1894798172] [2021-05-03 00:39:44,030 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-03 00:39:44,030 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:39:44,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-03 00:39:44,030 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-05-03 00:39:44,031 INFO L87 Difference]: Start difference. First operand 179 states and 231 transitions. Second operand has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 12 states have internal predecessors, (48), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-03 00:39:45,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:39:45,646 INFO L93 Difference]: Finished difference Result 206 states and 265 transitions. [2021-05-03 00:39:45,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-05-03 00:39:45,659 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 12 states have internal predecessors, (48), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) Word has length 77 [2021-05-03 00:39:45,659 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:39:45,660 INFO L225 Difference]: With dead ends: 206 [2021-05-03 00:39:45,660 INFO L226 Difference]: Without dead ends: 178 [2021-05-03 00:39:45,662 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 877.4ms TimeCoverageRelationStatistics Valid=92, Invalid=414, Unknown=0, NotChecked=0, Total=506 [2021-05-03 00:39:45,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-05-03 00:39:45,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 172. [2021-05-03 00:39:45,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 129 states have (on average 1.2248062015503876) internal successors, (158), 136 states have internal predecessors, (158), 26 states have call successors, (26), 14 states have call predecessors, (26), 16 states have return successors, (34), 21 states have call predecessors, (34), 21 states have call successors, (34) [2021-05-03 00:39:45,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 218 transitions. [2021-05-03 00:39:45,694 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 218 transitions. Word has length 77 [2021-05-03 00:39:45,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:39:45,695 INFO L480 AbstractCegarLoop]: Abstraction has 172 states and 218 transitions. [2021-05-03 00:39:45,695 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 12 states have internal predecessors, (48), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-03 00:39:45,695 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 218 transitions. [2021-05-03 00:39:45,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2021-05-03 00:39:45,697 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:39:45,697 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:39:45,697 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-05-03 00:39:45,697 INFO L428 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:39:45,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:39:45,697 INFO L82 PathProgramCache]: Analyzing trace with hash 873001991, now seen corresponding path program 10 times [2021-05-03 00:39:45,697 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:39:45,698 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [857332986] [2021-05-03 00:39:45,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:39:45,699 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:39:45,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:45,835 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:39:45,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:45,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:39:45,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:45,843 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:39:45,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:45,846 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:39:45,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:45,865 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:39:45,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:45,869 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:39:45,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:45,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-05-03 00:39:45,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:46,076 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 58 [2021-05-03 00:39:46,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:46,083 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:39:46,084 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:39:46,084 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [857332986] [2021-05-03 00:39:46,084 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [857332986] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:39:46,084 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:39:46,084 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-03 00:39:46,084 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971368872] [2021-05-03 00:39:46,084 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-03 00:39:46,084 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:39:46,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-03 00:39:46,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=176, Unknown=0, NotChecked=0, Total=210 [2021-05-03 00:39:46,085 INFO L87 Difference]: Start difference. First operand 172 states and 218 transitions. Second operand has 15 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 13 states have internal predecessors, (48), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-03 00:39:47,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:39:47,655 INFO L93 Difference]: Finished difference Result 252 states and 318 transitions. [2021-05-03 00:39:47,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-05-03 00:39:47,657 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 13 states have internal predecessors, (48), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) Word has length 77 [2021-05-03 00:39:47,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:39:47,659 INFO L225 Difference]: With dead ends: 252 [2021-05-03 00:39:47,659 INFO L226 Difference]: Without dead ends: 184 [2021-05-03 00:39:47,659 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 957.1ms TimeCoverageRelationStatistics Valid=117, Invalid=533, Unknown=0, NotChecked=0, Total=650 [2021-05-03 00:39:47,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2021-05-03 00:39:47,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 182. [2021-05-03 00:39:47,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 138 states have (on average 1.2246376811594204) internal successors, (169), 146 states have internal predecessors, (169), 26 states have call successors, (26), 14 states have call predecessors, (26), 17 states have return successors, (35), 21 states have call predecessors, (35), 21 states have call successors, (35) [2021-05-03 00:39:47,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 230 transitions. [2021-05-03 00:39:47,695 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 230 transitions. Word has length 77 [2021-05-03 00:39:47,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:39:47,695 INFO L480 AbstractCegarLoop]: Abstraction has 182 states and 230 transitions. [2021-05-03 00:39:47,695 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 3.4285714285714284) internal successors, (48), 13 states have internal predecessors, (48), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-03 00:39:47,695 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 230 transitions. [2021-05-03 00:39:47,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-03 00:39:47,697 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:39:47,697 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:39:47,697 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-05-03 00:39:47,697 INFO L428 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:39:47,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:39:47,697 INFO L82 PathProgramCache]: Analyzing trace with hash -1297400883, now seen corresponding path program 3 times [2021-05-03 00:39:47,698 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:39:47,698 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2075356746] [2021-05-03 00:39:47,698 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:39:47,735 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2021-05-03 00:39:47,736 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:39:47,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:47,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:39:47,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:47,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:39:47,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:47,899 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:39:47,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:47,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-05-03 00:39:47,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:47,924 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-05-03 00:39:47,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:47,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-05-03 00:39:47,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:47,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-05-03 00:39:47,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:48,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-05-03 00:39:48,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:48,201 WARN L205 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 27 [2021-05-03 00:39:48,389 WARN L205 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 29 [2021-05-03 00:39:48,595 WARN L205 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 27 [2021-05-03 00:39:48,644 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 66 [2021-05-03 00:39:48,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:48,647 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:39:48,648 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:39:48,648 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2075356746] [2021-05-03 00:39:48,648 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [2075356746] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:39:48,648 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:39:48,648 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-03 00:39:48,648 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367140298] [2021-05-03 00:39:48,648 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-03 00:39:48,648 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:39:48,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-03 00:39:48,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=208, Unknown=0, NotChecked=0, Total=240 [2021-05-03 00:39:48,649 INFO L87 Difference]: Start difference. First operand 182 states and 230 transitions. Second operand has 16 states, 15 states have (on average 3.4) internal successors, (51), 13 states have internal predecessors, (51), 4 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (9), 3 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-03 00:39:50,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:39:50,831 INFO L93 Difference]: Finished difference Result 222 states and 277 transitions. [2021-05-03 00:39:50,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-03 00:39:50,832 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 3.4) internal successors, (51), 13 states have internal predecessors, (51), 4 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (9), 3 states have call predecessors, (9), 4 states have call successors, (9) Word has length 78 [2021-05-03 00:39:50,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:39:50,834 INFO L225 Difference]: With dead ends: 222 [2021-05-03 00:39:50,834 INFO L226 Difference]: Without dead ends: 204 [2021-05-03 00:39:50,834 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 1619.8ms TimeCoverageRelationStatistics Valid=97, Invalid=659, Unknown=0, NotChecked=0, Total=756 [2021-05-03 00:39:50,835 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 204 states. [2021-05-03 00:39:50,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 204 to 182. [2021-05-03 00:39:50,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 138 states have (on average 1.2246376811594204) internal successors, (169), 146 states have internal predecessors, (169), 26 states have call successors, (26), 14 states have call predecessors, (26), 17 states have return successors, (33), 21 states have call predecessors, (33), 21 states have call successors, (33) [2021-05-03 00:39:50,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 228 transitions. [2021-05-03 00:39:50,867 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 228 transitions. Word has length 78 [2021-05-03 00:39:50,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:39:50,867 INFO L480 AbstractCegarLoop]: Abstraction has 182 states and 228 transitions. [2021-05-03 00:39:50,867 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 3.4) internal successors, (51), 13 states have internal predecessors, (51), 4 states have call successors, (12), 4 states have call predecessors, (12), 3 states have return successors, (9), 3 states have call predecessors, (9), 4 states have call successors, (9) [2021-05-03 00:39:50,868 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 228 transitions. [2021-05-03 00:39:50,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-05-03 00:39:50,868 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:39:50,868 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:39:50,869 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-05-03 00:39:50,869 INFO L428 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:39:50,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:39:50,869 INFO L82 PathProgramCache]: Analyzing trace with hash -2052199378, now seen corresponding path program 11 times [2021-05-03 00:39:50,869 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:39:50,869 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [347776514] [2021-05-03 00:39:50,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:39:50,870 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:39:50,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:50,977 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:39:50,978 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:50,990 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:39:50,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:50,994 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:39:50,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:50,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:39:50,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:51,016 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:39:51,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:51,019 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:39:51,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:51,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-05-03 00:39:51,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:51,028 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:39:51,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:51,201 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:39:51,201 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:39:51,201 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [347776514] [2021-05-03 00:39:51,202 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [347776514] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:39:51,202 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:39:51,202 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-03 00:39:51,202 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882707585] [2021-05-03 00:39:51,202 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-03 00:39:51,202 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:39:51,202 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-03 00:39:51,203 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=180, Unknown=0, NotChecked=0, Total=210 [2021-05-03 00:39:51,203 INFO L87 Difference]: Start difference. First operand 182 states and 228 transitions. Second operand has 15 states, 15 states have (on average 3.2666666666666666) internal successors, (49), 13 states have internal predecessors, (49), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-03 00:39:52,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:39:52,876 INFO L93 Difference]: Finished difference Result 199 states and 246 transitions. [2021-05-03 00:39:52,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-03 00:39:52,878 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.2666666666666666) internal successors, (49), 13 states have internal predecessors, (49), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) Word has length 78 [2021-05-03 00:39:52,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:39:52,885 INFO L225 Difference]: With dead ends: 199 [2021-05-03 00:39:52,885 INFO L226 Difference]: Without dead ends: 187 [2021-05-03 00:39:52,886 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 968.1ms TimeCoverageRelationStatistics Valid=141, Invalid=615, Unknown=0, NotChecked=0, Total=756 [2021-05-03 00:39:52,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 187 states. [2021-05-03 00:39:52,919 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 187 to 182. [2021-05-03 00:39:52,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 138 states have (on average 1.2246376811594204) internal successors, (169), 146 states have internal predecessors, (169), 26 states have call successors, (26), 14 states have call predecessors, (26), 17 states have return successors, (31), 21 states have call predecessors, (31), 21 states have call successors, (31) [2021-05-03 00:39:52,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 226 transitions. [2021-05-03 00:39:52,923 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 226 transitions. Word has length 78 [2021-05-03 00:39:52,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:39:52,923 INFO L480 AbstractCegarLoop]: Abstraction has 182 states and 226 transitions. [2021-05-03 00:39:52,924 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 15 states have (on average 3.2666666666666666) internal successors, (49), 13 states have internal predecessors, (49), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 2 states have call successors, (8) [2021-05-03 00:39:52,924 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 226 transitions. [2021-05-03 00:39:52,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-03 00:39:52,925 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:39:52,925 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:39:52,925 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-05-03 00:39:52,926 INFO L428 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:39:52,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:39:52,926 INFO L82 PathProgramCache]: Analyzing trace with hash -1971107334, now seen corresponding path program 12 times [2021-05-03 00:39:52,926 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:39:52,926 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1901945494] [2021-05-03 00:39:52,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:39:52,929 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:39:52,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:53,094 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:39:53,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:53,098 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:39:53,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:53,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:39:53,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:53,114 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:39:53,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:53,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:39:53,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:53,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:39:53,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:53,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-05-03 00:39:53,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:53,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 57 [2021-05-03 00:39:53,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:53,532 WARN L205 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 30 [2021-05-03 00:39:53,754 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:39:53,755 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:39:53,755 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1901945494] [2021-05-03 00:39:53,755 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1901945494] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:39:53,755 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:39:53,755 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-03 00:39:53,755 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720083658] [2021-05-03 00:39:53,755 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-03 00:39:53,756 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:39:53,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-03 00:39:53,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=302, Unknown=0, NotChecked=0, Total=342 [2021-05-03 00:39:53,756 INFO L87 Difference]: Start difference. First operand 182 states and 226 transitions. Second operand has 19 states, 18 states have (on average 2.9444444444444446) internal successors, (53), 16 states have internal predecessors, (53), 4 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-03 00:39:56,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:39:56,182 INFO L93 Difference]: Finished difference Result 251 states and 312 transitions. [2021-05-03 00:39:56,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-05-03 00:39:56,184 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.9444444444444446) internal successors, (53), 16 states have internal predecessors, (53), 4 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 79 [2021-05-03 00:39:56,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:39:56,185 INFO L225 Difference]: With dead ends: 251 [2021-05-03 00:39:56,186 INFO L226 Difference]: Without dead ends: 239 [2021-05-03 00:39:56,186 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 1701.8ms TimeCoverageRelationStatistics Valid=147, Invalid=1113, Unknown=0, NotChecked=0, Total=1260 [2021-05-03 00:39:56,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2021-05-03 00:39:56,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 201. [2021-05-03 00:39:56,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 154 states have (on average 1.2337662337662338) internal successors, (190), 164 states have internal predecessors, (190), 27 states have call successors, (27), 14 states have call predecessors, (27), 19 states have return successors, (33), 22 states have call predecessors, (33), 22 states have call successors, (33) [2021-05-03 00:39:56,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 250 transitions. [2021-05-03 00:39:56,227 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 250 transitions. Word has length 79 [2021-05-03 00:39:56,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:39:56,227 INFO L480 AbstractCegarLoop]: Abstraction has 201 states and 250 transitions. [2021-05-03 00:39:56,227 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 2.9444444444444446) internal successors, (53), 16 states have internal predecessors, (53), 4 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-03 00:39:56,227 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 250 transitions. [2021-05-03 00:39:56,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-05-03 00:39:56,228 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:39:56,228 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:39:56,228 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2021-05-03 00:39:56,229 INFO L428 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:39:56,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:39:56,229 INFO L82 PathProgramCache]: Analyzing trace with hash -1406881591, now seen corresponding path program 13 times [2021-05-03 00:39:56,229 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:39:56,229 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [174860982] [2021-05-03 00:39:56,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:39:56,230 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:39:56,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:56,455 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:39:56,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:56,460 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:39:56,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:56,464 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:39:56,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:56,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:39:56,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:56,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:39:56,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:56,500 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:39:56,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:56,503 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-05-03 00:39:56,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:56,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:39:56,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:39:56,918 WARN L205 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 27 [2021-05-03 00:39:57,094 WARN L205 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 29 [2021-05-03 00:39:57,263 WARN L205 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 27 [2021-05-03 00:39:57,310 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:39:57,310 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:39:57,310 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [174860982] [2021-05-03 00:39:57,310 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [174860982] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:39:57,310 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:39:57,310 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [19] imperfect sequences [] total 19 [2021-05-03 00:39:57,310 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550172678] [2021-05-03 00:39:57,311 INFO L460 AbstractCegarLoop]: Interpolant automaton has 19 states [2021-05-03 00:39:57,311 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:39:57,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-05-03 00:39:57,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=301, Unknown=0, NotChecked=0, Total=342 [2021-05-03 00:39:57,312 INFO L87 Difference]: Start difference. First operand 201 states and 250 transitions. Second operand has 19 states, 18 states have (on average 2.9444444444444446) internal successors, (53), 16 states have internal predecessors, (53), 4 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-03 00:39:59,150 WARN L205 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2021-05-03 00:39:59,346 WARN L205 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2021-05-03 00:40:00,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:40:00,319 INFO L93 Difference]: Finished difference Result 253 states and 314 transitions. [2021-05-03 00:40:00,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-03 00:40:00,321 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 18 states have (on average 2.9444444444444446) internal successors, (53), 16 states have internal predecessors, (53), 4 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 79 [2021-05-03 00:40:00,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:40:00,322 INFO L225 Difference]: With dead ends: 253 [2021-05-03 00:40:00,322 INFO L226 Difference]: Without dead ends: 241 [2021-05-03 00:40:00,323 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 157 ImplicationChecksByTransitivity, 1920.0ms TimeCoverageRelationStatistics Valid=116, Invalid=876, Unknown=0, NotChecked=0, Total=992 [2021-05-03 00:40:00,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2021-05-03 00:40:00,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 201. [2021-05-03 00:40:00,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 154 states have (on average 1.2337662337662338) internal successors, (190), 164 states have internal predecessors, (190), 27 states have call successors, (27), 14 states have call predecessors, (27), 19 states have return successors, (33), 22 states have call predecessors, (33), 22 states have call successors, (33) [2021-05-03 00:40:00,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 250 transitions. [2021-05-03 00:40:00,365 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 250 transitions. Word has length 79 [2021-05-03 00:40:00,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:40:00,365 INFO L480 AbstractCegarLoop]: Abstraction has 201 states and 250 transitions. [2021-05-03 00:40:00,365 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 19 states, 18 states have (on average 2.9444444444444446) internal successors, (53), 16 states have internal predecessors, (53), 4 states have call successors, (11), 4 states have call predecessors, (11), 3 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-03 00:40:00,366 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 250 transitions. [2021-05-03 00:40:00,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-03 00:40:00,367 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:40:00,367 INFO L523 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:40:00,367 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2021-05-03 00:40:00,367 INFO L428 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:40:00,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:40:00,367 INFO L82 PathProgramCache]: Analyzing trace with hash -1520136901, now seen corresponding path program 14 times [2021-05-03 00:40:00,367 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:40:00,367 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1721943104] [2021-05-03 00:40:00,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:40:00,369 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:40:00,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:00,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:40:00,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:00,484 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:40:00,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:00,486 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:40:00,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:00,490 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:40:00,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:00,509 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:40:00,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:00,512 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:40:00,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:00,515 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-05-03 00:40:00,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:00,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 61 [2021-05-03 00:40:00,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:00,721 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:40:00,721 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:40:00,721 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1721943104] [2021-05-03 00:40:00,721 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1721943104] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:40:00,721 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:40:00,721 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [16] imperfect sequences [] total 16 [2021-05-03 00:40:00,721 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241006434] [2021-05-03 00:40:00,721 INFO L460 AbstractCegarLoop]: Interpolant automaton has 16 states [2021-05-03 00:40:00,721 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:40:00,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-05-03 00:40:00,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2021-05-03 00:40:00,722 INFO L87 Difference]: Start difference. First operand 201 states and 250 transitions. Second operand has 16 states, 15 states have (on average 3.466666666666667) internal successors, (52), 14 states have internal predecessors, (52), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-03 00:40:01,670 WARN L205 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 47 [2021-05-03 00:40:01,852 WARN L205 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 47 [2021-05-03 00:40:02,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:40:02,701 INFO L93 Difference]: Finished difference Result 288 states and 358 transitions. [2021-05-03 00:40:02,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-05-03 00:40:02,704 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 15 states have (on average 3.466666666666667) internal successors, (52), 14 states have internal predecessors, (52), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) Word has length 80 [2021-05-03 00:40:02,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:40:02,706 INFO L225 Difference]: With dead ends: 288 [2021-05-03 00:40:02,706 INFO L226 Difference]: Without dead ends: 213 [2021-05-03 00:40:02,707 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 1135.4ms TimeCoverageRelationStatistics Valid=143, Invalid=669, Unknown=0, NotChecked=0, Total=812 [2021-05-03 00:40:02,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 213 states. [2021-05-03 00:40:02,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 213 to 191. [2021-05-03 00:40:02,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 191 states, 145 states have (on average 1.2275862068965517) internal successors, (178), 154 states have internal predecessors, (178), 27 states have call successors, (27), 14 states have call predecessors, (27), 18 states have return successors, (32), 22 states have call predecessors, (32), 22 states have call successors, (32) [2021-05-03 00:40:02,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 191 states to 191 states and 237 transitions. [2021-05-03 00:40:02,761 INFO L78 Accepts]: Start accepts. Automaton has 191 states and 237 transitions. Word has length 80 [2021-05-03 00:40:02,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:40:02,761 INFO L480 AbstractCegarLoop]: Abstraction has 191 states and 237 transitions. [2021-05-03 00:40:02,761 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 16 states, 15 states have (on average 3.466666666666667) internal successors, (52), 14 states have internal predecessors, (52), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-03 00:40:02,761 INFO L276 IsEmpty]: Start isEmpty. Operand 191 states and 237 transitions. [2021-05-03 00:40:02,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-05-03 00:40:02,762 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:40:02,762 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:40:02,762 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2021-05-03 00:40:02,762 INFO L428 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:40:02,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:40:02,763 INFO L82 PathProgramCache]: Analyzing trace with hash 1163958224, now seen corresponding path program 15 times [2021-05-03 00:40:02,763 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:40:02,763 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [638150278] [2021-05-03 00:40:02,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:40:02,766 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:40:02,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:03,063 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:40:03,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:03,070 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:40:03,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:03,074 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:40:03,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:03,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:40:03,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:03,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:40:03,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:03,369 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:40:03,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:03,375 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2021-05-03 00:40:03,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:03,382 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 59 [2021-05-03 00:40:03,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:03,391 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:40:03,392 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:40:03,392 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [638150278] [2021-05-03 00:40:03,392 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [638150278] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:40:03,392 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:40:03,392 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [] total 14 [2021-05-03 00:40:03,392 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2085749830] [2021-05-03 00:40:03,393 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-03 00:40:03,393 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:40:03,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-03 00:40:03,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2021-05-03 00:40:03,394 INFO L87 Difference]: Start difference. First operand 191 states and 237 transitions. Second operand has 14 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 12 states have internal predecessors, (46), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-03 00:40:05,566 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:40:05,567 INFO L93 Difference]: Finished difference Result 316 states and 401 transitions. [2021-05-03 00:40:05,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-05-03 00:40:05,570 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 12 states have internal predecessors, (46), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) Word has length 80 [2021-05-03 00:40:05,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:40:05,572 INFO L225 Difference]: With dead ends: 316 [2021-05-03 00:40:05,572 INFO L226 Difference]: Without dead ends: 209 [2021-05-03 00:40:05,573 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 1404.7ms TimeCoverageRelationStatistics Valid=119, Invalid=693, Unknown=0, NotChecked=0, Total=812 [2021-05-03 00:40:05,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-05-03 00:40:05,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 195. [2021-05-03 00:40:05,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 149 states have (on average 1.2281879194630871) internal successors, (183), 158 states have internal predecessors, (183), 27 states have call successors, (27), 14 states have call predecessors, (27), 18 states have return successors, (32), 22 states have call predecessors, (32), 22 states have call successors, (32) [2021-05-03 00:40:05,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 242 transitions. [2021-05-03 00:40:05,614 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 242 transitions. Word has length 80 [2021-05-03 00:40:05,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:40:05,614 INFO L480 AbstractCegarLoop]: Abstraction has 195 states and 242 transitions. [2021-05-03 00:40:05,614 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 14 states have (on average 3.2857142857142856) internal successors, (46), 12 states have internal predecessors, (46), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 3 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-03 00:40:05,614 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 242 transitions. [2021-05-03 00:40:05,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-03 00:40:05,615 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:40:05,615 INFO L523 BasicCegarLoop]: trace histogram [5, 3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:40:05,615 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2021-05-03 00:40:05,615 INFO L428 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:40:05,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:40:05,616 INFO L82 PathProgramCache]: Analyzing trace with hash 1835694648, now seen corresponding path program 16 times [2021-05-03 00:40:05,616 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:40:05,616 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [848406266] [2021-05-03 00:40:05,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:40:05,618 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:40:05,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:05,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:40:05,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:05,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:40:05,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:05,779 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:40:05,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:05,783 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2021-05-03 00:40:05,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:05,810 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2021-05-03 00:40:05,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:05,815 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 29 [2021-05-03 00:40:05,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:05,818 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 41 [2021-05-03 00:40:05,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:06,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 62 [2021-05-03 00:40:06,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:06,074 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:40:06,074 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:40:06,074 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [848406266] [2021-05-03 00:40:06,074 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [848406266] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:40:06,074 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:40:06,074 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [] total 15 [2021-05-03 00:40:06,074 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1067862247] [2021-05-03 00:40:06,075 INFO L460 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-05-03 00:40:06,075 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:40:06,075 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-05-03 00:40:06,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=175, Unknown=0, NotChecked=0, Total=210 [2021-05-03 00:40:06,075 INFO L87 Difference]: Start difference. First operand 195 states and 242 transitions. Second operand has 15 states, 14 states have (on average 3.642857142857143) internal successors, (51), 13 states have internal predecessors, (51), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-03 00:40:07,424 WARN L205 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 42 [2021-05-03 00:40:08,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:40:08,244 INFO L93 Difference]: Finished difference Result 266 states and 326 transitions. [2021-05-03 00:40:08,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-05-03 00:40:08,246 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 14 states have (on average 3.642857142857143) internal successors, (51), 13 states have internal predecessors, (51), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) Word has length 81 [2021-05-03 00:40:08,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:40:08,247 INFO L225 Difference]: With dead ends: 266 [2021-05-03 00:40:08,247 INFO L226 Difference]: Without dead ends: 201 [2021-05-03 00:40:08,248 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 1117.1ms TimeCoverageRelationStatistics Valid=109, Invalid=491, Unknown=0, NotChecked=0, Total=600 [2021-05-03 00:40:08,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2021-05-03 00:40:08,289 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 183. [2021-05-03 00:40:08,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 183 states, 139 states have (on average 1.223021582733813) internal successors, (170), 147 states have internal predecessors, (170), 26 states have call successors, (26), 14 states have call predecessors, (26), 17 states have return successors, (27), 21 states have call predecessors, (27), 21 states have call successors, (27) [2021-05-03 00:40:08,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 223 transitions. [2021-05-03 00:40:08,291 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 223 transitions. Word has length 81 [2021-05-03 00:40:08,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:40:08,291 INFO L480 AbstractCegarLoop]: Abstraction has 183 states and 223 transitions. [2021-05-03 00:40:08,291 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 15 states, 14 states have (on average 3.642857142857143) internal successors, (51), 13 states have internal predecessors, (51), 3 states have call successors, (11), 4 states have call predecessors, (11), 2 states have return successors, (8), 2 states have call predecessors, (8), 3 states have call successors, (8) [2021-05-03 00:40:08,291 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 223 transitions. [2021-05-03 00:40:08,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-05-03 00:40:08,293 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:40:08,293 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:40:08,293 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2021-05-03 00:40:08,293 INFO L428 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:40:08,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:40:08,294 INFO L82 PathProgramCache]: Analyzing trace with hash 1323547480, now seen corresponding path program 4 times [2021-05-03 00:40:08,294 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:40:08,294 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1856694597] [2021-05-03 00:40:08,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:40:08,363 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2021-05-03 00:40:08,364 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:40:08,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:08,585 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:40:08,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:08,594 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:40:08,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:08,597 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:40:08,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:08,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-05-03 00:40:08,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:08,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-05-03 00:40:08,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:08,641 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-05-03 00:40:08,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:08,645 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 40 [2021-05-03 00:40:08,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:08,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2021-05-03 00:40:08,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:08,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 63 [2021-05-03 00:40:08,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:08,660 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 71 [2021-05-03 00:40:08,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:08,665 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-05-03 00:40:08,665 INFO L179 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found an infeasible trace [2021-05-03 00:40:08,665 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1856694597] [2021-05-03 00:40:08,665 INFO L200 FreeRefinementEngine]: IpTcStrategyModulePreferences [1856694597] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-03 00:40:08,665 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-03 00:40:08,665 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2021-05-03 00:40:08,665 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2051144140] [2021-05-03 00:40:08,666 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-03 00:40:08,666 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-05-03 00:40:08,666 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-03 00:40:08,666 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-05-03 00:40:08,666 INFO L87 Difference]: Start difference. First operand 183 states and 223 transitions. Second operand has 12 states, 12 states have (on average 4.333333333333333) internal successors, (52), 9 states have internal predecessors, (52), 5 states have call successors, (13), 5 states have call predecessors, (13), 1 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-03 00:40:10,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-03 00:40:10,010 INFO L93 Difference]: Finished difference Result 202 states and 244 transitions. [2021-05-03 00:40:10,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-05-03 00:40:10,014 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.333333333333333) internal successors, (52), 9 states have internal predecessors, (52), 5 states have call successors, (13), 5 states have call predecessors, (13), 1 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) Word has length 83 [2021-05-03 00:40:10,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-03 00:40:10,015 INFO L225 Difference]: With dead ends: 202 [2021-05-03 00:40:10,015 INFO L226 Difference]: Without dead ends: 172 [2021-05-03 00:40:10,016 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 579.2ms TimeCoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2021-05-03 00:40:10,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-05-03 00:40:10,047 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 169. [2021-05-03 00:40:10,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 169 states, 129 states have (on average 1.2170542635658914) internal successors, (157), 136 states have internal predecessors, (157), 24 states have call successors, (24), 13 states have call predecessors, (24), 15 states have return successors, (24), 19 states have call predecessors, (24), 19 states have call successors, (24) [2021-05-03 00:40:10,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 205 transitions. [2021-05-03 00:40:10,049 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 205 transitions. Word has length 83 [2021-05-03 00:40:10,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-03 00:40:10,049 INFO L480 AbstractCegarLoop]: Abstraction has 169 states and 205 transitions. [2021-05-03 00:40:10,049 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 4.333333333333333) internal successors, (52), 9 states have internal predecessors, (52), 5 states have call successors, (13), 5 states have call predecessors, (13), 1 states have return successors, (10), 4 states have call predecessors, (10), 4 states have call successors, (10) [2021-05-03 00:40:10,049 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 205 transitions. [2021-05-03 00:40:10,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-05-03 00:40:10,050 INFO L515 BasicCegarLoop]: Found error trace [2021-05-03 00:40:10,050 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 2, 2, 2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-03 00:40:10,050 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2021-05-03 00:40:10,050 INFO L428 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-03 00:40:10,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-03 00:40:10,051 INFO L82 PathProgramCache]: Analyzing trace with hash 1632278354, now seen corresponding path program 1 times [2021-05-03 00:40:10,051 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-05-03 00:40:10,051 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [681541504] [2021-05-03 00:40:10,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-03 00:40:10,097 WARN L74 AcceleratorJordan]: Jordan acceleration failed, because NONLINEAR_UPDATE [2021-05-03 00:40:10,099 INFO L224 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-05-03 00:40:10,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:11,288 WARN L205 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 53 DAG size of output: 37 [2021-05-03 00:40:13,949 WARN L205 SmtUtils]: Spent 2.43 s on a formula simplification. DAG size of input: 83 DAG size of output: 70 [2021-05-03 00:40:16,865 WARN L205 SmtUtils]: Spent 2.30 s on a formula simplification. DAG size of input: 80 DAG size of output: 65 [2021-05-03 00:40:17,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-03 00:40:17,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:17,539 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2021-05-03 00:40:17,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:17,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 11 [2021-05-03 00:40:17,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:17,558 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 19 [2021-05-03 00:40:17,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:17,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2021-05-03 00:40:17,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:17,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 30 [2021-05-03 00:40:17,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:17,960 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 44 [2021-05-03 00:40:17,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-03 00:40:18,489 WARN L205 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 29 [2021-05-03 00:40:18,906 WARN L205 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 80 DAG size of output: 29 [2021-05-03 00:40:19,308 WARN L205 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 18 [2021-05-03 00:40:20,263 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 60 [2021-05-03 00:40:20,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat