/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/for_bounded_loop1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-1a84f73 [2021-04-30 22:36:10,871 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-04-30 22:36:10,873 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-04-30 22:36:10,893 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-04-30 22:36:10,909 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-04-30 22:36:10,909 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-04-30 22:36:10,910 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-04-30 22:36:10,911 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-04-30 22:36:10,911 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-04-30 22:36:10,912 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-04-30 22:36:10,913 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-04-30 22:36:10,914 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-04-30 22:36:10,915 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-04-30 22:36:10,916 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-04-30 22:36:10,917 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-04-30 22:36:10,917 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-04-30 22:36:10,919 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-04-30 22:36:10,934 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-04-30 22:36:10,934 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-04-30 22:36:10,935 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-04-30 22:36:10,936 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2021-04-30 22:36:10,953 INFO L113 SettingsManager]: Loading preferences was successful [2021-04-30 22:36:10,953 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-04-30 22:36:10,954 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-04-30 22:36:10,954 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-04-30 22:36:10,955 INFO L138 SettingsManager]: * Use SBE=true [2021-04-30 22:36:10,955 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-04-30 22:36:10,955 INFO L138 SettingsManager]: * sizeof long=4 [2021-04-30 22:36:10,955 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-04-30 22:36:10,955 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-04-30 22:36:10,955 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-04-30 22:36:10,955 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-04-30 22:36:10,955 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-04-30 22:36:10,955 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-04-30 22:36:10,955 INFO L138 SettingsManager]: * sizeof long double=12 [2021-04-30 22:36:10,956 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-04-30 22:36:10,956 INFO L138 SettingsManager]: * Use constant arrays=true [2021-04-30 22:36:10,956 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-04-30 22:36:10,956 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-04-30 22:36:10,956 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-04-30 22:36:10,956 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-04-30 22:36:10,956 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-04-30 22:36:10,965 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-04-30 22:36:10,965 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-04-30 22:36:10,965 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-04-30 22:36:10,965 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-04-30 22:36:10,966 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-04-30 22:36:10,966 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-04-30 22:36:10,966 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-04-30 22:36:10,966 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-04-30 22:36:11,261 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-04-30 22:36:11,370 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-04-30 22:36:11,372 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-04-30 22:36:11,373 INFO L271 PluginConnector]: Initializing CDTParser... [2021-04-30 22:36:11,374 INFO L275 PluginConnector]: CDTParser initialized [2021-04-30 22:36:11,375 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/for_bounded_loop1.c [2021-04-30 22:36:11,433 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/649f4cf64/bc78de0e2784490891289d2c0dca6ae9/FLAG1640458a0 [2021-04-30 22:36:11,854 INFO L306 CDTParser]: Found 1 translation units. [2021-04-30 22:36:11,854 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops/for_bounded_loop1.c [2021-04-30 22:36:11,859 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/649f4cf64/bc78de0e2784490891289d2c0dca6ae9/FLAG1640458a0 [2021-04-30 22:36:12,288 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/649f4cf64/bc78de0e2784490891289d2c0dca6ae9 [2021-04-30 22:36:12,293 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-04-30 22:36:12,295 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-04-30 22:36:12,297 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-04-30 22:36:12,298 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-04-30 22:36:12,300 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-04-30 22:36:12,301 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.04 10:36:12" (1/1) ... [2021-04-30 22:36:12,302 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7d64b59c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.04 10:36:12, skipping insertion in model container [2021-04-30 22:36:12,303 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.04 10:36:12" (1/1) ... [2021-04-30 22:36:12,308 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-04-30 22:36:12,318 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-04-30 22:36:12,424 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/for_bounded_loop1.c[416,429] [2021-04-30 22:36:12,433 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-04-30 22:36:12,439 INFO L203 MainTranslator]: Completed pre-run [2021-04-30 22:36:12,447 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/for_bounded_loop1.c[416,429] [2021-04-30 22:36:12,450 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-04-30 22:36:12,462 INFO L208 MainTranslator]: Completed translation [2021-04-30 22:36:12,463 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.04 10:36:12 WrapperNode [2021-04-30 22:36:12,463 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-04-30 22:36:12,464 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-04-30 22:36:12,464 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-04-30 22:36:12,464 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-04-30 22:36:12,483 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.04 10:36:12" (1/1) ... [2021-04-30 22:36:12,483 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.04 10:36:12" (1/1) ... [2021-04-30 22:36:12,492 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.04 10:36:12" (1/1) ... [2021-04-30 22:36:12,493 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.04 10:36:12" (1/1) ... [2021-04-30 22:36:12,496 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.04 10:36:12" (1/1) ... [2021-04-30 22:36:12,521 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.04 10:36:12" (1/1) ... [2021-04-30 22:36:12,521 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.04 10:36:12" (1/1) ... [2021-04-30 22:36:12,522 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-04-30 22:36:12,523 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-04-30 22:36:12,523 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-04-30 22:36:12,523 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-04-30 22:36:12,524 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.04 10:36:12" (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 [2021-04-30 22:36:12,609 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-04-30 22:36:12,610 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-04-30 22:36:12,610 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-04-30 22:36:12,610 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-04-30 22:36:12,610 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-04-30 22:36:12,610 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-04-30 22:36:12,611 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-04-30 22:36:12,611 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-04-30 22:36:12,611 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-04-30 22:36:12,611 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-04-30 22:36:12,611 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-04-30 22:36:12,611 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-04-30 22:36:12,612 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-04-30 22:36:12,612 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-04-30 22:36:12,613 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-04-30 22:36:12,614 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-04-30 22:36:12,614 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-04-30 22:36:12,614 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-04-30 22:36:12,614 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-04-30 22:36:12,614 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-04-30 22:36:12,877 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-04-30 22:36:12,878 INFO L299 CfgBuilder]: Removed 1 assume(true) statements. [2021-04-30 22:36:12,879 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.04 10:36:12 BoogieIcfgContainer [2021-04-30 22:36:12,879 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-04-30 22:36:12,880 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-04-30 22:36:12,880 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-04-30 22:36:12,884 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-04-30 22:36:12,884 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 30.04 10:36:12" (1/3) ... [2021-04-30 22:36:12,885 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@400e2a88 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.04 10:36:12, skipping insertion in model container [2021-04-30 22:36:12,885 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.04 10:36:12" (2/3) ... [2021-04-30 22:36:12,885 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@400e2a88 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.04 10:36:12, skipping insertion in model container [2021-04-30 22:36:12,885 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.04 10:36:12" (3/3) ... [2021-04-30 22:36:12,886 INFO L111 eAbstractionObserver]: Analyzing ICFG for_bounded_loop1.c [2021-04-30 22:36:12,890 INFO L149 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-04-30 22:36:12,892 INFO L161 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-04-30 22:36:12,903 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-04-30 22:36:12,918 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-04-30 22:36:12,918 INFO L377 AbstractCegarLoop]: Hoare is true [2021-04-30 22:36:12,918 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-04-30 22:36:12,919 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-04-30 22:36:12,919 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-04-30 22:36:12,919 INFO L381 AbstractCegarLoop]: Difference is false [2021-04-30 22:36:12,919 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-04-30 22:36:12,919 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-04-30 22:36:12,931 INFO L276 IsEmpty]: Start isEmpty. Operand has 24 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2021-04-30 22:36:12,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-04-30 22:36:12,934 INFO L511 BasicCegarLoop]: Found error trace [2021-04-30 22:36:12,935 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-04-30 22:36:12,935 INFO L428 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-04-30 22:36:12,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-30 22:36:12,942 INFO L82 PathProgramCache]: Analyzing trace with hash 669529748, now seen corresponding path program 1 times [2021-04-30 22:36:12,948 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-30 22:36:12,949 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70704085] [2021-04-30 22:36:12,949 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-30 22:36:13,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-30 22:36:13,061 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-30 22:36:13,062 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-30 22:36:13,063 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-30 22:36:13,064 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-30 22:36:13,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-04-30 22:36:13,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-30 22:36:13,119 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-30 22:36:13,120 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-30 22:36:13,121 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-30 22:36:13,121 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-04-30 22:36:13,121 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70704085] [2021-04-30 22:36:13,122 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [70704085] provided 1 perfect and 0 imperfect interpolant sequences [2021-04-30 22:36:13,122 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-30 22:36:13,122 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-04-30 22:36:13,122 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019447413] [2021-04-30 22:36:13,125 INFO L460 AbstractCegarLoop]: Interpolant automaton has 3 states [2021-04-30 22:36:13,125 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-04-30 22:36:13,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-04-30 22:36:13,133 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-04-30 22:36:13,134 INFO L87 Difference]: Start difference. First operand has 24 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 16 states have internal predecessors, (20), 5 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) 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) [2021-04-30 22:36:13,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-04-30 22:36:13,188 INFO L93 Difference]: Finished difference Result 41 states and 55 transitions. [2021-04-30 22:36:13,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-04-30 22:36:13,189 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 [2021-04-30 22:36:13,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-04-30 22:36:13,195 INFO L225 Difference]: With dead ends: 41 [2021-04-30 22:36:13,195 INFO L226 Difference]: Without dead ends: 20 [2021-04-30 22:36:13,197 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 45.5ms TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-04-30 22:36:13,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-04-30 22:36:13,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-04-30 22:36:13,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 13 states have internal predecessors, (14), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-04-30 22:36:13,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-04-30 22:36:13,224 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 12 [2021-04-30 22:36:13,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-04-30 22:36:13,224 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-04-30 22:36:13,224 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) [2021-04-30 22:36:13,224 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-04-30 22:36:13,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-04-30 22:36:13,225 INFO L511 BasicCegarLoop]: Found error trace [2021-04-30 22:36:13,225 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-04-30 22:36:13,226 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-04-30 22:36:13,226 INFO L428 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-04-30 22:36:13,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-30 22:36:13,226 INFO L82 PathProgramCache]: Analyzing trace with hash 657523975, now seen corresponding path program 1 times [2021-04-30 22:36:13,227 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-30 22:36:13,227 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1067860896] [2021-04-30 22:36:13,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-30 22:36:13,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-30 22:36:13,253 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-30 22:36:13,254 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-30 22:36:13,257 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-30 22:36:13,258 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-04-30 22:36:13,263 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-30 22:36:13,263 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-30 22:36:13,300 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-04-30 22:36:13,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-30 22:36:13,330 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-30 22:36:13,331 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-30 22:36:13,331 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-30 22:36:13,331 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-04-30 22:36:13,331 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1067860896] [2021-04-30 22:36:13,331 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1067860896] provided 1 perfect and 0 imperfect interpolant sequences [2021-04-30 22:36:13,332 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-30 22:36:13,332 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-04-30 22:36:13,332 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [423047068] [2021-04-30 22:36:13,333 INFO L460 AbstractCegarLoop]: Interpolant automaton has 4 states [2021-04-30 22:36:13,333 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-04-30 22:36:13,333 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-04-30 22:36:13,333 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-04-30 22:36:13,334 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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) [2021-04-30 22:36:13,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-04-30 22:36:13,462 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2021-04-30 22:36:13,463 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-04-30 22:36:13,463 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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 [2021-04-30 22:36:13,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-04-30 22:36:13,464 INFO L225 Difference]: With dead ends: 33 [2021-04-30 22:36:13,464 INFO L226 Difference]: Without dead ends: 26 [2021-04-30 22:36:13,464 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 84.2ms TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-04-30 22:36:13,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-04-30 22:36:13,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 21. [2021-04-30 22:36:13,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-04-30 22:36:13,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-04-30 22:36:13,471 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 12 [2021-04-30 22:36:13,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-04-30 22:36:13,471 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-04-30 22:36:13,471 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 3 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) [2021-04-30 22:36:13,471 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-04-30 22:36:13,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-04-30 22:36:13,471 INFO L511 BasicCegarLoop]: Found error trace [2021-04-30 22:36:13,471 INFO L519 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-04-30 22:36:13,471 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-04-30 22:36:13,472 INFO L428 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-04-30 22:36:13,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-30 22:36:13,472 INFO L82 PathProgramCache]: Analyzing trace with hash 659251853, now seen corresponding path program 1 times [2021-04-30 22:36:13,472 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-30 22:36:13,472 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [500902822] [2021-04-30 22:36:13,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-30 22:36:13,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-30 22:36:13,512 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-30 22:36:13,513 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-30 22:36:13,513 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-30 22:36:13,514 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-04-30 22:36:13,521 INFO L142 QuantifierPusher]: treesize reduction 9, result has 50.0 percent of original size [2021-04-30 22:36:13,528 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-04-30 22:36:13,534 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-30 22:36:13,535 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-04-30 22:36:13,538 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-30 22:36:13,542 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-04-30 22:36:13,549 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-30 22:36:13,550 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-30 22:36:13,594 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-04-30 22:36:13,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-30 22:36:13,603 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-30 22:36:13,604 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-30 22:36:13,604 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-30 22:36:13,604 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-04-30 22:36:13,604 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [500902822] [2021-04-30 22:36:13,604 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [500902822] provided 1 perfect and 0 imperfect interpolant sequences [2021-04-30 22:36:13,604 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-30 22:36:13,604 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-04-30 22:36:13,605 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [431356860] [2021-04-30 22:36:13,605 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-04-30 22:36:13,605 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-04-30 22:36:13,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-04-30 22:36:13,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-04-30 22:36:13,606 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 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) [2021-04-30 22:36:13,834 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-04-30 22:36:13,834 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2021-04-30 22:36:13,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-04-30 22:36:13,835 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 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 [2021-04-30 22:36:13,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-04-30 22:36:13,838 INFO L225 Difference]: With dead ends: 30 [2021-04-30 22:36:13,838 INFO L226 Difference]: Without dead ends: 28 [2021-04-30 22:36:13,839 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 181.2ms TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2021-04-30 22:36:13,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-04-30 22:36:13,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2021-04-30 22:36:13,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 16 states have (on average 1.125) internal successors, (18), 18 states have internal predecessors, (18), 6 states have call successors, (6), 4 states have call predecessors, (6), 3 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2021-04-30 22:36:13,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2021-04-30 22:36:13,857 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 12 [2021-04-30 22:36:13,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-04-30 22:36:13,857 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2021-04-30 22:36:13,857 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 7 states, 6 states have (on average 1.3333333333333333) internal successors, (8), 5 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) [2021-04-30 22:36:13,857 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2021-04-30 22:36:13,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-04-30 22:36:13,858 INFO L511 BasicCegarLoop]: Found error trace [2021-04-30 22:36:13,858 INFO L519 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-04-30 22:36:13,858 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-04-30 22:36:13,858 INFO L428 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-04-30 22:36:13,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-30 22:36:13,859 INFO L82 PathProgramCache]: Analyzing trace with hash -932371294, now seen corresponding path program 1 times [2021-04-30 22:36:13,859 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-30 22:36:13,859 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [8696752] [2021-04-30 22:36:13,859 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-30 22:36:13,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-30 22:36:13,903 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-30 22:36:13,910 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-30 22:36:13,911 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-30 22:36:13,912 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 7 [2021-04-30 22:36:13,918 INFO L142 QuantifierPusher]: treesize reduction 11, result has 54.2 percent of original size [2021-04-30 22:36:13,918 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 13 [2021-04-30 22:36:13,930 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-30 22:36:13,931 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 9 [2021-04-30 22:36:13,953 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-30 22:36:13,953 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-04-30 22:36:13,973 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-30 22:36:13,973 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 4 [2021-04-30 22:36:13,979 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-30 22:36:13,979 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-30 22:36:14,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-04-30 22:36:14,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-30 22:36:14,012 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-30 22:36:14,012 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-30 22:36:14,013 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-04-30 22:36:14,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-04-30 22:36:14,016 INFO L142 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-04-30 22:36:14,017 INFO L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-04-30 22:36:14,017 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-04-30 22:36:14,017 INFO L179 FreeRefinementEngine]: Strategy CAMEL found an infeasible trace [2021-04-30 22:36:14,017 INFO L361 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [8696752] [2021-04-30 22:36:14,018 INFO L200 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [8696752] provided 1 perfect and 0 imperfect interpolant sequences [2021-04-30 22:36:14,018 INFO L226 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-04-30 22:36:14,018 INFO L239 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-04-30 22:36:14,018 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140020598] [2021-04-30 22:36:14,018 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-04-30 22:36:14,018 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-04-30 22:36:14,019 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-04-30 22:36:14,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-04-30 22:36:14,019 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-04-30 22:36:14,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-04-30 22:36:14,228 INFO L93 Difference]: Finished difference Result 38 states and 41 transitions. [2021-04-30 22:36:14,228 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-04-30 22:36:14,228 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 19 [2021-04-30 22:36:14,229 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-04-30 22:36:14,230 INFO L225 Difference]: With dead ends: 38 [2021-04-30 22:36:14,230 INFO L226 Difference]: Without dead ends: 36 [2021-04-30 22:36:14,231 INFO L775 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 186.0ms TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-04-30 22:36:14,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-04-30 22:36:14,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 33. [2021-04-30 22:36:14,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 21 states have (on average 1.0952380952380953) internal successors, (23), 23 states have internal predecessors, (23), 7 states have call successors, (7), 5 states have call predecessors, (7), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-04-30 22:36:14,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2021-04-30 22:36:14,245 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 19 [2021-04-30 22:36:14,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-04-30 22:36:14,245 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2021-04-30 22:36:14,245 INFO L481 AbstractCegarLoop]: Interpolant automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 3 states have call successors, (4), 3 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-04-30 22:36:14,245 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2021-04-30 22:36:14,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-04-30 22:36:14,247 INFO L511 BasicCegarLoop]: Found error trace [2021-04-30 22:36:14,247 INFO L519 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-04-30 22:36:14,247 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-04-30 22:36:14,247 INFO L428 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-04-30 22:36:14,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-04-30 22:36:14,250 INFO L82 PathProgramCache]: Analyzing trace with hash 1861509246, now seen corresponding path program 1 times [2021-04-30 22:36:14,251 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-04-30 22:36:14,255 INFO L361 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1796461186] [2021-04-30 22:36:14,255 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-04-30 22:36:14,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-30 22:36:14,268 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-30 22:36:14,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-04-30 22:36:14,279 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-04-30 22:36:14,307 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-04-30 22:36:14,307 INFO L620 BasicCegarLoop]: Counterexample might be feasible [2021-04-30 22:36:14,307 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-04-30 22:36:14,325 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 30.04 10:36:14 BoogieIcfgContainer [2021-04-30 22:36:14,325 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-04-30 22:36:14,326 INFO L168 Benchmark]: Toolchain (without parser) took 2030.39 ms. Allocated memory was 218.1 MB in the beginning and 272.6 MB in the end (delta: 54.5 MB). Free memory was 183.2 MB in the beginning and 188.3 MB in the end (delta: -5.1 MB). Peak memory consumption was 51.0 MB. Max. memory is 8.0 GB. [2021-04-30 22:36:14,326 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 218.1 MB. Free memory is still 199.5 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-04-30 22:36:14,326 INFO L168 Benchmark]: CACSL2BoogieTranslator took 165.63 ms. Allocated memory is still 218.1 MB. Free memory was 183.0 MB in the beginning and 173.4 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-04-30 22:36:14,327 INFO L168 Benchmark]: Boogie Preprocessor took 58.87 ms. Allocated memory is still 218.1 MB. Free memory was 173.4 MB in the beginning and 200.6 MB in the end (delta: -27.2 MB). Peak memory consumption was 3.2 MB. Max. memory is 8.0 GB. [2021-04-30 22:36:14,327 INFO L168 Benchmark]: RCFGBuilder took 355.64 ms. Allocated memory is still 218.1 MB. Free memory was 200.6 MB in the beginning and 186.6 MB in the end (delta: 14.0 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2021-04-30 22:36:14,327 INFO L168 Benchmark]: TraceAbstraction took 1445.22 ms. Allocated memory was 218.1 MB in the beginning and 272.6 MB in the end (delta: 54.5 MB). Free memory was 185.9 MB in the beginning and 188.3 MB in the end (delta: -2.4 MB). Peak memory consumption was 53.0 MB. Max. memory is 8.0 GB. [2021-04-30 22:36:14,329 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 218.1 MB. Free memory is still 199.5 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 165.63 ms. Allocated memory is still 218.1 MB. Free memory was 183.0 MB in the beginning and 173.4 MB in the end (delta: 9.5 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 58.87 ms. Allocated memory is still 218.1 MB. Free memory was 173.4 MB in the beginning and 200.6 MB in the end (delta: -27.2 MB). Peak memory consumption was 3.2 MB. Max. memory is 8.0 GB. * RCFGBuilder took 355.64 ms. Allocated memory is still 218.1 MB. Free memory was 200.6 MB in the beginning and 186.6 MB in the end (delta: 14.0 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1445.22 ms. Allocated memory was 218.1 MB in the beginning and 272.6 MB in the end (delta: 54.5 MB). Free memory was 185.9 MB in the beginning and 188.3 MB in the end (delta: -2.4 MB). Peak memory consumption was 53.0 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 11]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L19] int i=0, x=0, y=0; [L20] int n=__VERIFIER_nondet_int(); [L21] COND FALSE !(!(n>0)) [L22] i=0 VAL [i=0, n=1, x=0, y=0] [L22] COND TRUE i