/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/AutomizerCTransformed.xml -s ../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/sumt3.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 06:38:11,850 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 06:38:11,851 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 06:38:11,881 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 06:38:11,946 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-06 06:38:11,959 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 06:38:11,959 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 06:38:11,961 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 06:38:11,961 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 06:38:11,961 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 06:38:11,962 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 06:38:11,962 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 06:38:11,962 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 06:38:11,962 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 06:38:11,962 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 06:38:11,962 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 06:38:11,963 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 06:38:11,963 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 06:38:11,963 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 06:38:11,963 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 06:38:11,963 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 06:38:11,963 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 06:38:11,963 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 06:38:11,964 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 06:38:11,964 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 06:38:11,964 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 06:38:11,964 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-06 06:38:11,965 INFO L138 SettingsManager]: * TransformationType=LOOP_ACCELERATION_JORDAN 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 06:38:12,199 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 06:38:12,211 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 06:38:12,213 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 06:38:12,214 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 06:38:12,214 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 06:38:12,215 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/sumt3.c [2021-05-06 06:38:12,250 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b059bb9a/b2c56208593c4cbe94e3fec619cc844b/FLAGe894103c2 [2021-05-06 06:38:12,585 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 06:38:12,585 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt3.c [2021-05-06 06:38:12,589 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b059bb9a/b2c56208593c4cbe94e3fec619cc844b/FLAGe894103c2 [2021-05-06 06:38:12,603 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4b059bb9a/b2c56208593c4cbe94e3fec619cc844b [2021-05-06 06:38:12,605 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 06:38:12,606 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-06 06:38:12,610 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 06:38:12,610 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 06:38:12,613 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 06:38:12,613 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 06:38:12" (1/1) ... [2021-05-06 06:38:12,614 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@68d00ad5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:38:12, skipping insertion in model container [2021-05-06 06:38:12,614 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 06:38:12" (1/1) ... [2021-05-06 06:38:12,618 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 06:38:12,628 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 06:38:12,737 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt3.c[403,416] [2021-05-06 06:38:12,750 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 06:38:12,756 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 06:38:12,764 WARN L224 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/sumt3.c[403,416] [2021-05-06 06:38:12,776 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 06:38:12,786 INFO L208 MainTranslator]: Completed translation [2021-05-06 06:38:12,786 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:38:12 WrapperNode [2021-05-06 06:38:12,786 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 06:38:12,787 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 06:38:12,788 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 06:38:12,788 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 06:38:12,806 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:38:12" (1/1) ... [2021-05-06 06:38:12,806 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:38:12" (1/1) ... [2021-05-06 06:38:12,812 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:38:12" (1/1) ... [2021-05-06 06:38:12,812 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:38:12" (1/1) ... [2021-05-06 06:38:12,831 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:38:12" (1/1) ... [2021-05-06 06:38:12,834 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:38:12" (1/1) ... [2021-05-06 06:38:12,836 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:38:12" (1/1) ... [2021-05-06 06:38:12,840 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 06:38:12,841 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 06:38:12,841 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 06:38:12,841 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 06:38:12,842 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:38:12" (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 [2021-05-06 06:38:12,969 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 06:38:12,970 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 06:38:12,970 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 06:38:12,970 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-05-06 06:38:12,970 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 06:38:12,970 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 06:38:12,970 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 06:38:12,970 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 06:38:12,971 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 06:38:12,971 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 06:38:12,971 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-05-06 06:38:12,971 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 06:38:12,971 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2021-05-06 06:38:12,971 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 06:38:12,971 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 06:38:12,971 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 06:38:12,971 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 06:38:12,972 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 06:38:12,972 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 06:38:12,972 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 06:38:15,358 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 06:38:15,358 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-05-06 06:38:15,359 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 06:38:15 BoogieIcfgContainer [2021-05-06 06:38:15,359 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 06:38:15,360 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-06 06:38:15,360 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-06 06:38:15,360 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-06 06:38:15,362 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 06:38:15" (1/1) ... [2021-05-06 06:38:15,370 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 06:38:15 BasicIcfg [2021-05-06 06:38:15,370 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-06 06:38:15,371 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 06:38:15,371 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 06:38:15,373 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 06:38:15,373 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 06:38:12" (1/4) ... [2021-05-06 06:38:15,374 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f3a7021 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 06:38:15, skipping insertion in model container [2021-05-06 06:38:15,374 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:38:12" (2/4) ... [2021-05-06 06:38:15,374 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f3a7021 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 06:38:15, skipping insertion in model container [2021-05-06 06:38:15,374 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 06:38:15" (3/4) ... [2021-05-06 06:38:15,374 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f3a7021 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 06:38:15, skipping insertion in model container [2021-05-06 06:38:15,374 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 06:38:15" (4/4) ... [2021-05-06 06:38:15,375 INFO L111 eAbstractionObserver]: Analyzing ICFG sumt3.cJordan [2021-05-06 06:38:15,379 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-06 06:38:15,382 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 06:38:15,391 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 06:38:15,403 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 06:38:15,403 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-06 06:38:15,403 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-06 06:38:15,403 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 06:38:15,403 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 06:38:15,403 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 06:38:15,403 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 06:38:15,403 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 06:38:15,411 INFO L276 IsEmpty]: Start isEmpty. Operand has 23 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 16 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-05-06 06:38:15,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 06:38:15,414 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:38:15,415 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:38:15,415 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:38:15,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:38:15,418 INFO L82 PathProgramCache]: Analyzing trace with hash -1944242814, now seen corresponding path program 1 times [2021-05-06 06:38:15,423 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:38:15,423 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [277695191] [2021-05-06 06:38:15,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:38:15,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:15,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:38:15,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:15,554 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:38:15,554 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:38:15,555 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [277695191] [2021-05-06 06:38:15,555 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [277695191] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 06:38:15,555 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 06:38:15,555 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 06:38:15,556 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [283228279] [2021-05-06 06:38:15,558 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 06:38:15,558 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:38:15,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 06:38:15,566 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 06:38:15,568 INFO L87 Difference]: Start difference. First operand has 23 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 16 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 3 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:15,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:38:15,606 INFO L93 Difference]: Finished difference Result 23 states and 26 transitions. [2021-05-06 06:38:15,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 06:38:15,608 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 06:38:15,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:38:15,612 INFO L225 Difference]: With dead ends: 23 [2021-05-06 06:38:15,612 INFO L226 Difference]: Without dead ends: 16 [2021-05-06 06:38:15,613 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 36.2ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 06:38:15,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-05-06 06:38:15,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-05-06 06:38:15,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:15,629 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-05-06 06:38:15,630 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 12 [2021-05-06 06:38:15,630 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:38:15,630 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-05-06 06:38:15,630 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:15,630 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-05-06 06:38:15,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-05-06 06:38:15,631 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:38:15,631 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:38:15,631 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 06:38:15,631 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:38:15,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:38:15,632 INFO L82 PathProgramCache]: Analyzing trace with hash -1943319293, now seen corresponding path program 1 times [2021-05-06 06:38:15,632 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:38:15,632 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [384585511] [2021-05-06 06:38:15,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:38:15,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:15,794 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:38:15,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:15,802 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:38:15,802 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:38:15,802 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [384585511] [2021-05-06 06:38:15,802 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [384585511] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 06:38:15,802 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 06:38:15,802 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-05-06 06:38:15,802 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2073710400] [2021-05-06 06:38:15,803 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 06:38:15,803 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:38:15,804 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 06:38:15,804 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-05-06 06:38:15,804 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:18,168 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:38:18,168 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2021-05-06 06:38:18,168 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 06:38:18,169 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 12 [2021-05-06 06:38:18,169 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:38:18,170 INFO L225 Difference]: With dead ends: 21 [2021-05-06 06:38:18,170 INFO L226 Difference]: Without dead ends: 18 [2021-05-06 06:38:18,171 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 197.1ms TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-05-06 06:38:18,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-05-06 06:38:18,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2021-05-06 06:38:18,173 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:18,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-05-06 06:38:18,173 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2021-05-06 06:38:18,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:38:18,173 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-05-06 06:38:18,173 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 4 states have internal predecessors, (8), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:18,174 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-05-06 06:38:18,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-06 06:38:18,174 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:38:18,174 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:38:18,174 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 06:38:18,174 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:38:18,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:38:18,175 INFO L82 PathProgramCache]: Analyzing trace with hash 1088614638, now seen corresponding path program 1 times [2021-05-06 06:38:18,175 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:38:18,175 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [529872331] [2021-05-06 06:38:18,175 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:38:18,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:18,490 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:38:18,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:18,497 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:38:18,497 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:38:18,497 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [529872331] [2021-05-06 06:38:18,497 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [529872331] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:38:18,497 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1139250068] [2021-05-06 06:38:18,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:38:18,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:18,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 15 conjunts are in the unsatisfiable core [2021-05-06 06:38:18,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:38:18,744 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:38:18,776 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:38:18,776 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1139250068] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:38:18,776 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:38:18,776 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 14 [2021-05-06 06:38:18,776 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1601427007] [2021-05-06 06:38:18,777 INFO L460 AbstractCegarLoop]: Interpolant automaton has 14 states [2021-05-06 06:38:18,777 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:38:18,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-05-06 06:38:18,778 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=146, Unknown=0, NotChecked=0, Total=182 [2021-05-06 06:38:18,778 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 11 states have internal predecessors, (18), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:23,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:38:23,574 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2021-05-06 06:38:23,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 06:38:23,574 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 11 states have internal predecessors, (18), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 15 [2021-05-06 06:38:23,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:38:23,575 INFO L225 Difference]: With dead ends: 24 [2021-05-06 06:38:23,575 INFO L226 Difference]: Without dead ends: 21 [2021-05-06 06:38:23,575 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 596.7ms TimeCoverageRelationStatistics Valid=74, Invalid=306, Unknown=0, NotChecked=0, Total=380 [2021-05-06 06:38:23,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-06 06:38:23,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-05-06 06:38:23,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.25) internal successors, (20), 16 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:23,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2021-05-06 06:38:23,577 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 15 [2021-05-06 06:38:23,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:38:23,578 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2021-05-06 06:38:23,578 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 11 states have internal predecessors, (18), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:23,578 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2021-05-06 06:38:23,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-05-06 06:38:23,578 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:38:23,578 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:38:23,788 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-06 06:38:23,789 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:38:23,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:38:23,789 INFO L82 PathProgramCache]: Analyzing trace with hash -2078903839, now seen corresponding path program 1 times [2021-05-06 06:38:23,790 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:38:23,790 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1299365236] [2021-05-06 06:38:23,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:38:23,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:23,915 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:38:23,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:23,922 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:38:23,922 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:38:23,922 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1299365236] [2021-05-06 06:38:23,922 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1299365236] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 06:38:23,922 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 06:38:23,922 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 06:38:23,922 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933687166] [2021-05-06 06:38:23,923 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 06:38:23,923 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:38:23,923 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 06:38:23,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 06:38:23,923 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:23,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:38:23,986 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2021-05-06 06:38:23,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 06:38:23,986 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 16 [2021-05-06 06:38:23,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:38:23,987 INFO L225 Difference]: With dead ends: 21 [2021-05-06 06:38:23,987 INFO L226 Difference]: Without dead ends: 21 [2021-05-06 06:38:23,987 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 2 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 63.6ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 06:38:23,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-05-06 06:38:23,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-05-06 06:38:23,990 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:23,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-05-06 06:38:23,990 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 16 [2021-05-06 06:38:23,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:38:23,990 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-05-06 06:38:23,990 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 3 states have internal predecessors, (12), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:23,990 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-05-06 06:38:23,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 06:38:23,991 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:38:23,991 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:38:23,991 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-05-06 06:38:23,991 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:38:23,991 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:38:23,991 INFO L82 PathProgramCache]: Analyzing trace with hash 187967564, now seen corresponding path program 1 times [2021-05-06 06:38:23,992 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:38:23,992 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [42497540] [2021-05-06 06:38:23,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:38:24,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:24,053 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:38:24,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:24,057 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:38:24,058 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:38:24,058 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [42497540] [2021-05-06 06:38:24,058 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [42497540] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:38:24,058 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [931065672] [2021-05-06 06:38:24,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:38:24,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:24,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-06 06:38:24,181 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:38:24,309 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:38:24,325 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:38:24,325 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [931065672] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:38:24,326 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:38:24,326 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 9] total 12 [2021-05-06 06:38:24,326 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581733666] [2021-05-06 06:38:24,326 INFO L460 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-05-06 06:38:24,326 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:38:24,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-05-06 06:38:24,327 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=107, Unknown=0, NotChecked=0, Total=132 [2021-05-06 06:38:24,327 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 12 states, 12 states have (on average 2.25) internal successors, (27), 10 states have internal predecessors, (27), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:26,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:38:26,750 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2021-05-06 06:38:26,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-05-06 06:38:26,750 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 10 states have internal predecessors, (27), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-06 06:38:26,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:38:26,751 INFO L225 Difference]: With dead ends: 23 [2021-05-06 06:38:26,751 INFO L226 Difference]: Without dead ends: 23 [2021-05-06 06:38:26,751 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 279.2ms TimeCoverageRelationStatistics Valid=51, Invalid=221, Unknown=0, NotChecked=0, Total=272 [2021-05-06 06:38:26,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-06 06:38:26,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-05-06 06:38:26,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:26,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-05-06 06:38:26,753 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2021-05-06 06:38:26,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:38:26,753 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-05-06 06:38:26,753 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 12 states, 12 states have (on average 2.25) internal successors, (27), 10 states have internal predecessors, (27), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:26,753 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-05-06 06:38:26,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 06:38:26,754 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:38:26,754 INFO L523 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:38:26,964 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:38:26,965 INFO L428 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:38:26,965 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:38:26,965 INFO L82 PathProgramCache]: Analyzing trace with hash 1075471245, now seen corresponding path program 1 times [2021-05-06 06:38:26,965 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:38:26,965 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1871396992] [2021-05-06 06:38:26,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:38:26,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:27,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:38:27,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:27,288 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:38:27,288 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:38:27,288 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1871396992] [2021-05-06 06:38:27,288 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1871396992] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:38:27,288 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [143976787] [2021-05-06 06:38:27,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:38:27,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:27,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 19 conjunts are in the unsatisfiable core [2021-05-06 06:38:27,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:38:27,500 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:38:27,523 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:38:27,524 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [143976787] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:38:27,524 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:38:27,524 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9] total 18 [2021-05-06 06:38:27,524 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814153750] [2021-05-06 06:38:27,524 INFO L460 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-05-06 06:38:27,524 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:38:27,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-05-06 06:38:27,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=256, Unknown=0, NotChecked=0, Total=306 [2021-05-06 06:38:27,525 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 18 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 15 states have internal predecessors, (26), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:30,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:38:30,253 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2021-05-06 06:38:30,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-05-06 06:38:30,253 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 15 states have internal predecessors, (26), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-05-06 06:38:30,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:38:30,254 INFO L225 Difference]: With dead ends: 29 [2021-05-06 06:38:30,254 INFO L226 Difference]: Without dead ends: 26 [2021-05-06 06:38:30,254 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 734.5ms TimeCoverageRelationStatistics Valid=102, Invalid=548, Unknown=0, NotChecked=0, Total=650 [2021-05-06 06:38:30,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-05-06 06:38:30,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-05-06 06:38:30,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.1428571428571428) internal successors, (24), 21 states have internal predecessors, (24), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:30,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2021-05-06 06:38:30,256 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2021-05-06 06:38:30,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:38:30,257 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2021-05-06 06:38:30,257 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 18 states, 17 states have (on average 1.5294117647058822) internal successors, (26), 15 states have internal predecessors, (26), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:30,257 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2021-05-06 06:38:30,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-05-06 06:38:30,257 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:38:30,257 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:38:30,464 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:38:30,465 INFO L428 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:38:30,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:38:30,465 INFO L82 PathProgramCache]: Analyzing trace with hash -433900693, now seen corresponding path program 1 times [2021-05-06 06:38:30,465 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:38:30,465 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1142320871] [2021-05-06 06:38:30,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:38:30,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:30,782 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:38:30,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:30,787 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:38:30,787 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:38:30,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1142320871] [2021-05-06 06:38:30,787 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1142320871] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:38:30,787 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1282379246] [2021-05-06 06:38:30,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:38:30,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:30,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 23 conjunts are in the unsatisfiable core [2021-05-06 06:38:30,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:38:31,031 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:38:31,054 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:38:31,054 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1282379246] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:38:31,054 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:38:31,054 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11] total 22 [2021-05-06 06:38:31,054 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1758567306] [2021-05-06 06:38:31,055 INFO L460 AbstractCegarLoop]: Interpolant automaton has 22 states [2021-05-06 06:38:31,055 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:38:31,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-05-06 06:38:31,055 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=396, Unknown=0, NotChecked=0, Total=462 [2021-05-06 06:38:31,055 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 22 states, 21 states have (on average 1.619047619047619) internal successors, (34), 19 states have internal predecessors, (34), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:38,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:38:38,415 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2021-05-06 06:38:38,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-05-06 06:38:38,415 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 21 states have (on average 1.619047619047619) internal successors, (34), 19 states have internal predecessors, (34), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 23 [2021-05-06 06:38:38,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:38:38,416 INFO L225 Difference]: With dead ends: 32 [2021-05-06 06:38:38,416 INFO L226 Difference]: Without dead ends: 29 [2021-05-06 06:38:38,416 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 233 ImplicationChecksByTransitivity, 1414.8ms TimeCoverageRelationStatistics Valid=149, Invalid=973, Unknown=0, NotChecked=0, Total=1122 [2021-05-06 06:38:38,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-05-06 06:38:38,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2021-05-06 06:38:38,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 23 states have (on average 1.1304347826086956) internal successors, (26), 23 states have internal predecessors, (26), 3 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:38,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-05-06 06:38:38,419 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 23 [2021-05-06 06:38:38,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:38:38,419 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-05-06 06:38:38,419 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 22 states, 21 states have (on average 1.619047619047619) internal successors, (34), 19 states have internal predecessors, (34), 3 states have call successors, (5), 4 states have call predecessors, (5), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:38:38,419 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-05-06 06:38:38,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-05-06 06:38:38,420 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:38:38,420 INFO L523 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:38:38,628 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:38:38,629 INFO L428 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:38:38,629 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:38:38,629 INFO L82 PathProgramCache]: Analyzing trace with hash -129461882, now seen corresponding path program 2 times [2021-05-06 06:38:38,629 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:38:38,629 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1680818221] [2021-05-06 06:38:38,629 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:38:38,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:39,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:38:39,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:38:39,081 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:38:39,081 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:38:39,081 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1680818221] [2021-05-06 06:38:39,081 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1680818221] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:38:39,081 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1510514942] [2021-05-06 06:38:39,081 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true