/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/nested5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-6253b08 [2021-05-06 06:35:53,697 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-05-06 06:35:53,698 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-05-06 06:35:53,716 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-05-06 06:35:53,742 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-05-06 06:35:53,742 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-05-06 06:35:53,743 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-05-06 06:35:53,743 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/LoopAccelerationJordanC.epf [2021-05-06 06:35:53,750 INFO L113 SettingsManager]: Loading preferences was successful [2021-05-06 06:35:53,751 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-05-06 06:35:53,752 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-05-06 06:35:53,752 INFO L138 SettingsManager]: * sizeof long=4 [2021-05-06 06:35:53,752 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-05-06 06:35:53,756 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-05-06 06:35:53,756 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-05-06 06:35:53,757 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-05-06 06:35:53,757 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-05-06 06:35:53,757 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-05-06 06:35:53,757 INFO L138 SettingsManager]: * sizeof long double=12 [2021-05-06 06:35:53,757 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-05-06 06:35:53,757 INFO L138 SettingsManager]: * Use constant arrays=true [2021-05-06 06:35:53,757 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-05-06 06:35:53,757 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-05-06 06:35:53,757 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-05-06 06:35:53,757 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-05-06 06:35:53,767 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-05-06 06:35:53,767 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-05-06 06:35:53,767 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-05-06 06:35:53,768 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-05-06 06:35:53,768 INFO L136 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2021-05-06 06:35:53,768 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.core: Log level for class -> de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=WARN; [2021-05-06 06:35:53,983 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-05-06 06:35:53,999 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-05-06 06:35:54,001 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-05-06 06:35:54,001 INFO L271 PluginConnector]: Initializing CDTParser... [2021-05-06 06:35:54,002 INFO L275 PluginConnector]: CDTParser initialized [2021-05-06 06:35:54,003 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/nested5-1.c [2021-05-06 06:35:54,043 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b670b8045/9a273de99e164086a8bfa28ca6345539/FLAG920b7d5cd [2021-05-06 06:35:54,414 INFO L306 CDTParser]: Found 1 translation units. [2021-05-06 06:35:54,414 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/nested5-1.c [2021-05-06 06:35:54,424 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b670b8045/9a273de99e164086a8bfa28ca6345539/FLAG920b7d5cd [2021-05-06 06:35:54,809 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b670b8045/9a273de99e164086a8bfa28ca6345539 [2021-05-06 06:35:54,811 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-05-06 06:35:54,812 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2021-05-06 06:35:54,813 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-05-06 06:35:54,813 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-05-06 06:35:54,834 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-05-06 06:35:54,835 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 06:35:54" (1/1) ... [2021-05-06 06:35:54,836 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1f3d6b13 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:35:54, skipping insertion in model container [2021-05-06 06:35:54,836 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.05 06:35:54" (1/1) ... [2021-05-06 06:35:54,840 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-05-06 06:35:54,849 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-05-06 06:35:54,949 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/nested5-1.c[321,334] [2021-05-06 06:35:54,957 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 06:35:54,962 INFO L203 MainTranslator]: Completed pre-run [2021-05-06 06:35:54,969 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/nested5-1.c[321,334] [2021-05-06 06:35:54,972 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-05-06 06:35:54,983 INFO L208 MainTranslator]: Completed translation [2021-05-06 06:35:54,983 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:35:54 WrapperNode [2021-05-06 06:35:54,983 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-05-06 06:35:54,985 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-05-06 06:35:54,985 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-05-06 06:35:54,985 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-05-06 06:35:54,995 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:35:54" (1/1) ... [2021-05-06 06:35:54,995 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:35:54" (1/1) ... [2021-05-06 06:35:55,000 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:35:54" (1/1) ... [2021-05-06 06:35:55,000 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:35:54" (1/1) ... [2021-05-06 06:35:55,036 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:35:54" (1/1) ... [2021-05-06 06:35:55,048 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:35:54" (1/1) ... [2021-05-06 06:35:55,052 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:35:54" (1/1) ... [2021-05-06 06:35:55,057 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-05-06 06:35:55,058 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-05-06 06:35:55,058 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-05-06 06:35:55,058 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-05-06 06:35:55,059 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:35:54" (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 06:35:55,110 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-05-06 06:35:55,110 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-05-06 06:35:55,110 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-05-06 06:35:55,110 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-05-06 06:35:55,110 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-05-06 06:35:55,110 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-05-06 06:35:55,110 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-05-06 06:35:55,111 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-05-06 06:35:55,111 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-05-06 06:35:55,111 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-05-06 06:35:55,111 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-05-06 06:35:55,111 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-05-06 06:35:55,111 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-05-06 06:35:55,112 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-05-06 06:35:55,112 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-05-06 06:35:55,112 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-05-06 06:35:55,112 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-05-06 06:35:55,365 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-05-06 06:35:55,366 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2021-05-06 06:35:55,366 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 06:35:55 BoogieIcfgContainer [2021-05-06 06:35:55,367 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-05-06 06:35:55,367 INFO L113 PluginConnector]: ------------------------IcfgTransformer---------------------------- [2021-05-06 06:35:55,367 INFO L271 PluginConnector]: Initializing IcfgTransformer... [2021-05-06 06:35:55,368 INFO L275 PluginConnector]: IcfgTransformer initialized [2021-05-06 06:35:55,369 INFO L185 PluginConnector]: Executing the observer IcfgTransformationObserver from plugin IcfgTransformer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 06:35:55" (1/1) ... [2021-05-06 06:35:55,379 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 06:35:55 BasicIcfg [2021-05-06 06:35:55,379 INFO L132 PluginConnector]: ------------------------ END IcfgTransformer---------------------------- [2021-05-06 06:35:55,380 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-05-06 06:35:55,380 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-05-06 06:35:55,382 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-05-06 06:35:55,382 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.05 06:35:54" (1/4) ... [2021-05-06 06:35:55,383 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7266710e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 06:35:55, skipping insertion in model container [2021-05-06 06:35:55,383 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.05 06:35:54" (2/4) ... [2021-05-06 06:35:55,383 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7266710e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.05 06:35:55, skipping insertion in model container [2021-05-06 06:35:55,383 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.05 06:35:55" (3/4) ... [2021-05-06 06:35:55,383 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7266710e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 06:35:55, skipping insertion in model container [2021-05-06 06:35:55,383 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.icfgtransformation CFG 06.05 06:35:55" (4/4) ... [2021-05-06 06:35:55,384 INFO L111 eAbstractionObserver]: Analyzing ICFG nested5-1.cJordan [2021-05-06 06:35:55,387 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:ForwardPredicates Determinization: PREDICATE_ABSTRACTION [2021-05-06 06:35:55,391 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-05-06 06:35:55,401 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-05-06 06:35:55,420 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-05-06 06:35:55,421 INFO L377 AbstractCegarLoop]: Hoare is false [2021-05-06 06:35:55,421 INFO L378 AbstractCegarLoop]: Compute interpolants for ForwardPredicates [2021-05-06 06:35:55,421 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-05-06 06:35:55,421 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-05-06 06:35:55,421 INFO L381 AbstractCegarLoop]: Difference is false [2021-05-06 06:35:55,421 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-05-06 06:35:55,421 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-05-06 06:35:55,433 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 20 states have (on average 1.6) internal successors, (32), 21 states have internal predecessors, (32), 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 06:35:55,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-06 06:35:55,439 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:35:55,440 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:35:55,440 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:35:55,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:35:55,444 INFO L82 PathProgramCache]: Analyzing trace with hash -1895308246, now seen corresponding path program 1 times [2021-05-06 06:35:55,449 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:35:55,449 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1421121390] [2021-05-06 06:35:55,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:35:55,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:35:55,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:35:55,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:35:55,646 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 06:35:55,647 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:35:55,647 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1421121390] [2021-05-06 06:35:55,647 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1421121390] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 06:35:55,647 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 06:35:55,648 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-05-06 06:35:55,648 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [561582352] [2021-05-06 06:35:55,650 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-05-06 06:35:55,651 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:35:55,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-05-06 06:35:55,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 06:35:55,661 INFO L87 Difference]: Start difference. First operand has 28 states, 20 states have (on average 1.6) internal successors, (32), 21 states have internal predecessors, (32), 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 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 06:35:55,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:35:55,696 INFO L93 Difference]: Finished difference Result 28 states and 32 transitions. [2021-05-06 06:35:55,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-05-06 06:35:55,697 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 15 [2021-05-06 06:35:55,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:35:55,701 INFO L225 Difference]: With dead ends: 28 [2021-05-06 06:35:55,702 INFO L226 Difference]: Without dead ends: 23 [2021-05-06 06:35:55,702 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 48.9ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-05-06 06:35:55,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-05-06 06:35:55,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-05-06 06:35:55,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 17 states have (on average 1.2941176470588236) internal successors, (22), 17 states have internal predecessors, (22), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 06:35:55,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-05-06 06:35:55,721 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 15 [2021-05-06 06:35:55,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:35:55,721 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-05-06 06:35:55,721 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 2 states have internal predecessors, (11), 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 06:35:55,722 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-05-06 06:35:55,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-05-06 06:35:55,722 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:35:55,722 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:35:55,722 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-05-06 06:35:55,722 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:35:55,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:35:55,723 INFO L82 PathProgramCache]: Analyzing trace with hash -1894384725, now seen corresponding path program 1 times [2021-05-06 06:35:55,723 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:35:55,723 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1076113523] [2021-05-06 06:35:55,723 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:35:55,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:35:55,797 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:35:55,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:35:55,829 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 06:35:55,829 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:35:55,829 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1076113523] [2021-05-06 06:35:55,830 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1076113523] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 06:35:55,830 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-05-06 06:35:55,830 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-05-06 06:35:55,830 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076805698] [2021-05-06 06:35:55,831 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-05-06 06:35:55,831 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:35:55,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-05-06 06:35:55,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-05-06 06:35:55,831 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 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 06:35:55,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:35:55,893 INFO L93 Difference]: Finished difference Result 32 states and 39 transitions. [2021-05-06 06:35:55,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-05-06 06:35:55,894 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 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 15 [2021-05-06 06:35:55,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:35:55,896 INFO L225 Difference]: With dead ends: 32 [2021-05-06 06:35:55,897 INFO L226 Difference]: Without dead ends: 32 [2021-05-06 06:35:55,897 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 49.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-05-06 06:35:55,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-05-06 06:35:55,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2021-05-06 06:35:55,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 06:35:55,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2021-05-06 06:35:55,900 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 15 [2021-05-06 06:35:55,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:35:55,900 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2021-05-06 06:35:55,900 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 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 06:35:55,900 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2021-05-06 06:35:55,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-05-06 06:35:55,901 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:35:55,901 INFO L523 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:35:55,901 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-05-06 06:35:55,901 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:35:55,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:35:55,902 INFO L82 PathProgramCache]: Analyzing trace with hash 1473809801, now seen corresponding path program 1 times [2021-05-06 06:35:55,902 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:35:55,902 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1279374022] [2021-05-06 06:35:55,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:35:55,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:35:56,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:35:56,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:35:56,008 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 06:35:56,008 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:35:56,008 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1279374022] [2021-05-06 06:35:56,008 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1279374022] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:35:56,008 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1072482229] [2021-05-06 06:35:56,008 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 06:35:56,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:35:56,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 5 conjunts are in the unsatisfiable core [2021-05-06 06:35:56,067 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:35:56,111 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 06:35:56,111 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1072482229] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:35:56,111 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:35:56,111 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2021-05-06 06:35:56,111 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102778021] [2021-05-06 06:35:56,112 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-05-06 06:35:56,112 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:35:56,112 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-05-06 06:35:56,112 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-05-06 06:35:56,113 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:35:56,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:35:56,238 INFO L93 Difference]: Finished difference Result 34 states and 41 transitions. [2021-05-06 06:35:56,238 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-05-06 06:35:56,238 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 17 [2021-05-06 06:35:56,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:35:56,239 INFO L225 Difference]: With dead ends: 34 [2021-05-06 06:35:56,239 INFO L226 Difference]: Without dead ends: 34 [2021-05-06 06:35:56,239 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 78.2ms TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-05-06 06:35:56,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-05-06 06:35:56,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 26. [2021-05-06 06:35:56,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 06:35:56,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 30 transitions. [2021-05-06 06:35:56,242 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 30 transitions. Word has length 17 [2021-05-06 06:35:56,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:35:56,243 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 30 transitions. [2021-05-06 06:35:56,243 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 6 states, 6 states have (on average 2.6666666666666665) internal successors, (16), 5 states have internal predecessors, (16), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:35:56,243 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 30 transitions. [2021-05-06 06:35:56,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-05-06 06:35:56,243 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:35:56,243 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 06:35:56,460 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-05-06 06:35:56,462 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:35:56,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:35:56,462 INFO L82 PathProgramCache]: Analyzing trace with hash -96591897, now seen corresponding path program 2 times [2021-05-06 06:35:56,463 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:35:56,463 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1952940516] [2021-05-06 06:35:56,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:35:56,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:35:56,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:35:56,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:35:56,570 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:35:56,570 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:35:56,570 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1952940516] [2021-05-06 06:35:56,571 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1952940516] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:35:56,571 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [92096088] [2021-05-06 06:35:56,571 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 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 06:35:56,629 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-05-06 06:35:56,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:35:56,630 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2021-05-06 06:35:56,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:35:56,705 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:35:56,718 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:35:56,718 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [92096088] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:35:56,718 INFO L226 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-05-06 06:35:56,718 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2021-05-06 06:35:56,718 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519758983] [2021-05-06 06:35:56,719 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 06:35:56,719 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:35:56,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 06:35:56,719 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-05-06 06:35:56,720 INFO L87 Difference]: Start difference. First operand 26 states and 30 transitions. Second operand has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:35:56,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:35:56,873 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2021-05-06 06:35:56,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-05-06 06:35:56,873 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 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 06:35:56,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:35:56,874 INFO L225 Difference]: With dead ends: 36 [2021-05-06 06:35:56,874 INFO L226 Difference]: Without dead ends: 36 [2021-05-06 06:35:56,874 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 1 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 121.6ms TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2021-05-06 06:35:56,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-05-06 06:35:56,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 28. [2021-05-06 06:35:56,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 22 states have (on average 1.2272727272727273) internal successors, (27), 22 states have internal predecessors, (27), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-05-06 06:35:56,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2021-05-06 06:35:56,877 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 19 [2021-05-06 06:35:56,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:35:56,878 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2021-05-06 06:35:56,878 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 6 states have internal predecessors, (18), 2 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-05-06 06:35:56,878 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2021-05-06 06:35:56,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-05-06 06:35:56,878 INFO L515 BasicCegarLoop]: Found error trace [2021-05-06 06:35:56,878 INFO L523 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-05-06 06:35:57,095 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:35:57,095 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-05-06 06:35:57,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-05-06 06:35:57,096 INFO L82 PathProgramCache]: Analyzing trace with hash -1719102779, now seen corresponding path program 3 times [2021-05-06 06:35:57,096 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-05-06 06:35:57,096 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1652476972] [2021-05-06 06:35:57,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-05-06 06:35:57,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:35:57,164 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-05-06 06:35:57,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-05-06 06:35:57,174 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-05-06 06:35:57,174 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-05-06 06:35:57,174 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1652476972] [2021-05-06 06:35:57,174 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1652476972] provided 0 perfect and 1 imperfect interpolant sequences [2021-05-06 06:35:57,174 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1854625373] [2021-05-06 06:35:57,175 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 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 06:35:57,299 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-05-06 06:35:57,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-05-06 06:35:57,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 10 conjunts are in the unsatisfiable core [2021-05-06 06:35:57,302 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-05-06 06:35:57,399 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:35:57,407 WARN L159 QuantifierPusher]: Ignoring assumption. [2021-05-06 06:35:57,602 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-05-06 06:35:57,603 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1854625373] provided 1 perfect and 0 imperfect interpolant sequences [2021-05-06 06:35:57,603 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-05-06 06:35:57,603 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [7] total 12 [2021-05-06 06:35:57,603 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272120585] [2021-05-06 06:35:57,603 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-05-06 06:35:57,603 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-05-06 06:35:57,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-05-06 06:35:57,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2021-05-06 06:35:57,604 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand has 7 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 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 06:35:58,127 WARN L205 SmtUtils]: Spent 247.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2021-05-06 06:35:58,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-05-06 06:35:58,230 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2021-05-06 06:35:58,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-05-06 06:35:58,231 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 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 21 [2021-05-06 06:35:58,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-05-06 06:35:58,231 INFO L225 Difference]: With dead ends: 33 [2021-05-06 06:35:58,231 INFO L226 Difference]: Without dead ends: 0 [2021-05-06 06:35:58,231 INFO L779 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 722.3ms TimeCoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-05-06 06:35:58,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-05-06 06:35:58,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-05-06 06:35:58,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-05-06 06:35:58,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-05-06 06:35:58,232 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 21 [2021-05-06 06:35:58,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-05-06 06:35:58,232 INFO L480 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-05-06 06:35:58,232 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 6 states have (on average 2.5) internal successors, (15), 6 states have internal predecessors, (15), 2 states have call successors, (3), 2 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 06:35:58,232 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-05-06 06:35:58,232 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-05-06 06:35:58,436 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-05-06 06:35:58,440 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.05 06:35:58 BasicIcfg [2021-05-06 06:35:58,440 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-05-06 06:35:58,440 INFO L168 Benchmark]: Toolchain (without parser) took 3628.63 ms. Allocated memory was 211.8 MB in the beginning and 256.9 MB in the end (delta: 45.1 MB). Free memory was 177.1 MB in the beginning and 123.5 MB in the end (delta: 53.6 MB). Peak memory consumption was 99.7 MB. Max. memory is 8.0 GB. [2021-05-06 06:35:58,440 INFO L168 Benchmark]: CDTParser took 0.09 ms. Allocated memory is still 211.8 MB. Free memory is still 193.4 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-05-06 06:35:58,441 INFO L168 Benchmark]: CACSL2BoogieTranslator took 170.75 ms. Allocated memory is still 211.8 MB. Free memory was 177.0 MB in the beginning and 167.5 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-05-06 06:35:58,441 INFO L168 Benchmark]: Boogie Preprocessor took 71.83 ms. Allocated memory is still 211.8 MB. Free memory was 167.4 MB in the beginning and 195.3 MB in the end (delta: -27.9 MB). Peak memory consumption was 5.5 MB. Max. memory is 8.0 GB. [2021-05-06 06:35:58,441 INFO L168 Benchmark]: RCFGBuilder took 308.67 ms. Allocated memory is still 211.8 MB. Free memory was 195.3 MB in the beginning and 179.8 MB in the end (delta: 15.5 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. [2021-05-06 06:35:58,441 INFO L168 Benchmark]: IcfgTransformer took 12.23 ms. Allocated memory is still 211.8 MB. Free memory was 179.8 MB in the beginning and 178.7 MB in the end (delta: 1.1 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-05-06 06:35:58,441 INFO L168 Benchmark]: TraceAbstraction took 3059.65 ms. Allocated memory was 211.8 MB in the beginning and 256.9 MB in the end (delta: 45.1 MB). Free memory was 178.1 MB in the beginning and 123.5 MB in the end (delta: 54.6 MB). Peak memory consumption was 99.5 MB. Max. memory is 8.0 GB. [2021-05-06 06:35:58,442 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.09 ms. Allocated memory is still 211.8 MB. Free memory is still 193.4 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 170.75 ms. Allocated memory is still 211.8 MB. Free memory was 177.0 MB in the beginning and 167.5 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 71.83 ms. Allocated memory is still 211.8 MB. Free memory was 167.4 MB in the beginning and 195.3 MB in the end (delta: -27.9 MB). Peak memory consumption was 5.5 MB. Max. memory is 8.0 GB. * RCFGBuilder took 308.67 ms. Allocated memory is still 211.8 MB. Free memory was 195.3 MB in the beginning and 179.8 MB in the end (delta: 15.5 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. * IcfgTransformer took 12.23 ms. Allocated memory is still 211.8 MB. Free memory was 179.8 MB in the beginning and 178.7 MB in the end (delta: 1.1 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3059.65 ms. Allocated memory was 211.8 MB in the beginning and 256.9 MB in the end (delta: 45.1 MB). Free memory was 178.1 MB in the beginning and 123.5 MB in the end (delta: 54.6 MB). Peak memory consumption was 99.5 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 7]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 28 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 3018.1ms, OverallIterations: 5, TraceHistogramMax: 3, EmptinessCheckTime: 12.0ms, AutomataDifference: 1028.3ms, DeadEndRemovalTime: 0.0ms, HoareAnnotationTime: 0.0ms, InitialAbstractionConstructionTime: 7.7ms, PartialOrderReductionTime: 0.0ms, HoareTripleCheckerStatistics: 128 SDtfs, 189 SDslu, 132 SDs, 0 SdLazy, 224 SolverSat, 26 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 299.1ms Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 99 GetRequests, 67 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1020.4ms Time, 0.0ms BasicInterpolantAutomatonTime, BiggestAbstraction: size=28occurred in iteration=0, InterpolantAutomatonStates: 26, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0ms DumpTime, AutomataMinimizationStatistics: 18.8ms AutomataMinimizationTime, 5 MinimizatonAttempts, 24 StatesRemovedByMinimization, 3 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 37.5ms SsaConstructionTime, 206.9ms SatisfiabilityAnalysisTime, 886.3ms InterpolantComputationTime, 144 NumberOfCodeBlocks, 142 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 136 ConstructedInterpolants, 0 QuantifiedInterpolants, 510 SizeOfPredicates, 4 NumberOfNonLiveVariables, 330 ConjunctsInSsa, 22 ConjunctsInUnsatCore, 8 InterpolantComputations, 3 PerfectInterpolantSequences, 9/28 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold RESULT: Ultimate proved your program to be correct! Received shutdown request...