/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/list-ext3-properties/sll_length_check-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-72570d3 [2020-08-22 22:21:14,510 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-22 22:21:14,512 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-22 22:21:14,554 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-22 22:21:14,554 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-22 22:21:14,563 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-22 22:21:14,564 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-22 22:21:14,567 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-22 22:21:14,569 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-22 22:21:14,571 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-22 22:21:14,572 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-22 22:21:14,574 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-22 22:21:14,575 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-22 22:21:14,578 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-22 22:21:14,581 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-22 22:21:14,582 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-22 22:21:14,584 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-22 22:21:14,585 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-22 22:21:14,587 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-22 22:21:14,593 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-22 22:21:14,596 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-22 22:21:14,597 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-22 22:21:14,597 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-22 22:21:14,598 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-22 22:21:14,610 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-22 22:21:14,611 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-22 22:21:14,611 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-22 22:21:14,615 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-22 22:21:14,615 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-22 22:21:14,616 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-08-22 22:21:14,616 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-22 22:21:14,620 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-22 22:21:14,621 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-22 22:21:14,622 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-22 22:21:14,622 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-22 22:21:14,623 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-22 22:21:14,623 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-22 22:21:14,623 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-22 22:21:14,624 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-22 22:21:14,624 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-22 22:21:14,630 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-22 22:21:14,631 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-08-22 22:21:14,640 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-22 22:21:14,641 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-22 22:21:14,642 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-22 22:21:14,642 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-22 22:21:14,642 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-22 22:21:14,643 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-22 22:21:14,643 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-22 22:21:14,643 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-22 22:21:14,643 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-22 22:21:14,643 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-22 22:21:14,643 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-22 22:21:14,644 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-22 22:21:14,644 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-22 22:21:14,644 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-22 22:21:14,644 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-22 22:21:14,644 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-08-22 22:21:14,645 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-22 22:21:14,645 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-22 22:21:14,645 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 22:21:14,645 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-22 22:21:14,645 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-08-22 22:21:14,646 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-22 22:21:14,646 INFO L138 SettingsManager]: * Use separate solver for trace checks=false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-08-22 22:21:14,952 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-22 22:21:14,969 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-22 22:21:14,972 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-22 22:21:14,974 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-22 22:21:14,974 INFO L275 PluginConnector]: CDTParser initialized [2020-08-22 22:21:14,975 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/list-ext3-properties/sll_length_check-1.i [2020-08-22 22:21:15,046 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4225c2630/128e1fc9cd1747c3babdcabfdd9e42d7/FLAGaef2933ae [2020-08-22 22:21:15,593 INFO L306 CDTParser]: Found 1 translation units. [2020-08-22 22:21:15,594 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/list-ext3-properties/sll_length_check-1.i [2020-08-22 22:21:15,610 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4225c2630/128e1fc9cd1747c3babdcabfdd9e42d7/FLAGaef2933ae [2020-08-22 22:21:15,863 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4225c2630/128e1fc9cd1747c3babdcabfdd9e42d7 [2020-08-22 22:21:15,873 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-22 22:21:15,875 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-22 22:21:15,876 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-22 22:21:15,877 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-22 22:21:15,880 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-22 22:21:15,882 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 10:21:15" (1/1) ... [2020-08-22 22:21:15,885 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@752f575a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:21:15, skipping insertion in model container [2020-08-22 22:21:15,885 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.08 10:21:15" (1/1) ... [2020-08-22 22:21:15,893 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-22 22:21:15,948 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-22 22:21:16,384 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 22:21:16,395 INFO L203 MainTranslator]: Completed pre-run [2020-08-22 22:21:16,441 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-22 22:21:16,503 INFO L208 MainTranslator]: Completed translation [2020-08-22 22:21:16,504 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:21:16 WrapperNode [2020-08-22 22:21:16,504 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-22 22:21:16,505 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-22 22:21:16,505 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-22 22:21:16,505 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-22 22:21:16,525 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:21:16" (1/1) ... [2020-08-22 22:21:16,526 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:21:16" (1/1) ... [2020-08-22 22:21:16,543 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:21:16" (1/1) ... [2020-08-22 22:21:16,544 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:21:16" (1/1) ... [2020-08-22 22:21:16,559 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:21:16" (1/1) ... [2020-08-22 22:21:16,565 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:21:16" (1/1) ... [2020-08-22 22:21:16,569 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:21:16" (1/1) ... [2020-08-22 22:21:16,576 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-22 22:21:16,577 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-22 22:21:16,577 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-22 22:21:16,577 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-22 22:21:16,578 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:21:16" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-22 22:21:16,677 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-22 22:21:16,677 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-22 22:21:16,677 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_32 [2020-08-22 22:21:16,677 INFO L138 BoogieDeclarations]: Found implementation of procedure __bswap_64 [2020-08-22 22:21:16,677 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2020-08-22 22:21:16,678 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_create [2020-08-22 22:21:16,678 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_length [2020-08-22 22:21:16,678 INFO L138 BoogieDeclarations]: Found implementation of procedure sll_destroy [2020-08-22 22:21:16,678 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-22 22:21:16,678 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-22 22:21:16,679 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-22 22:21:16,679 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_32 [2020-08-22 22:21:16,680 INFO L130 BoogieDeclarations]: Found specification of procedure __bswap_64 [2020-08-22 22:21:16,680 INFO L130 BoogieDeclarations]: Found specification of procedure __ctype_get_mb_cur_max [2020-08-22 22:21:16,680 INFO L130 BoogieDeclarations]: Found specification of procedure atof [2020-08-22 22:21:16,681 INFO L130 BoogieDeclarations]: Found specification of procedure atoi [2020-08-22 22:21:16,681 INFO L130 BoogieDeclarations]: Found specification of procedure atol [2020-08-22 22:21:16,681 INFO L130 BoogieDeclarations]: Found specification of procedure atoll [2020-08-22 22:21:16,682 INFO L130 BoogieDeclarations]: Found specification of procedure strtod [2020-08-22 22:21:16,682 INFO L130 BoogieDeclarations]: Found specification of procedure strtof [2020-08-22 22:21:16,683 INFO L130 BoogieDeclarations]: Found specification of procedure strtold [2020-08-22 22:21:16,683 INFO L130 BoogieDeclarations]: Found specification of procedure strtol [2020-08-22 22:21:16,685 INFO L130 BoogieDeclarations]: Found specification of procedure strtoul [2020-08-22 22:21:16,686 INFO L130 BoogieDeclarations]: Found specification of procedure strtoq [2020-08-22 22:21:16,686 INFO L130 BoogieDeclarations]: Found specification of procedure strtouq [2020-08-22 22:21:16,686 INFO L130 BoogieDeclarations]: Found specification of procedure strtoll [2020-08-22 22:21:16,686 INFO L130 BoogieDeclarations]: Found specification of procedure strtoull [2020-08-22 22:21:16,686 INFO L130 BoogieDeclarations]: Found specification of procedure l64a [2020-08-22 22:21:16,687 INFO L130 BoogieDeclarations]: Found specification of procedure a64l [2020-08-22 22:21:16,687 INFO L130 BoogieDeclarations]: Found specification of procedure select [2020-08-22 22:21:16,687 INFO L130 BoogieDeclarations]: Found specification of procedure pselect [2020-08-22 22:21:16,687 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_major [2020-08-22 22:21:16,687 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_minor [2020-08-22 22:21:16,687 INFO L130 BoogieDeclarations]: Found specification of procedure gnu_dev_makedev [2020-08-22 22:21:16,687 INFO L130 BoogieDeclarations]: Found specification of procedure random [2020-08-22 22:21:16,688 INFO L130 BoogieDeclarations]: Found specification of procedure srandom [2020-08-22 22:21:16,688 INFO L130 BoogieDeclarations]: Found specification of procedure initstate [2020-08-22 22:21:16,688 INFO L130 BoogieDeclarations]: Found specification of procedure setstate [2020-08-22 22:21:16,688 INFO L130 BoogieDeclarations]: Found specification of procedure random_r [2020-08-22 22:21:16,688 INFO L130 BoogieDeclarations]: Found specification of procedure srandom_r [2020-08-22 22:21:16,688 INFO L130 BoogieDeclarations]: Found specification of procedure initstate_r [2020-08-22 22:21:16,689 INFO L130 BoogieDeclarations]: Found specification of procedure setstate_r [2020-08-22 22:21:16,689 INFO L130 BoogieDeclarations]: Found specification of procedure rand [2020-08-22 22:21:16,689 INFO L130 BoogieDeclarations]: Found specification of procedure srand [2020-08-22 22:21:16,689 INFO L130 BoogieDeclarations]: Found specification of procedure rand_r [2020-08-22 22:21:16,689 INFO L130 BoogieDeclarations]: Found specification of procedure drand48 [2020-08-22 22:21:16,690 INFO L130 BoogieDeclarations]: Found specification of procedure erand48 [2020-08-22 22:21:16,690 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48 [2020-08-22 22:21:16,690 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48 [2020-08-22 22:21:16,690 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48 [2020-08-22 22:21:16,690 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48 [2020-08-22 22:21:16,690 INFO L130 BoogieDeclarations]: Found specification of procedure srand48 [2020-08-22 22:21:16,690 INFO L130 BoogieDeclarations]: Found specification of procedure seed48 [2020-08-22 22:21:16,691 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48 [2020-08-22 22:21:16,691 INFO L130 BoogieDeclarations]: Found specification of procedure drand48_r [2020-08-22 22:21:16,691 INFO L130 BoogieDeclarations]: Found specification of procedure erand48_r [2020-08-22 22:21:16,691 INFO L130 BoogieDeclarations]: Found specification of procedure lrand48_r [2020-08-22 22:21:16,691 INFO L130 BoogieDeclarations]: Found specification of procedure nrand48_r [2020-08-22 22:21:16,692 INFO L130 BoogieDeclarations]: Found specification of procedure mrand48_r [2020-08-22 22:21:16,692 INFO L130 BoogieDeclarations]: Found specification of procedure jrand48_r [2020-08-22 22:21:16,692 INFO L130 BoogieDeclarations]: Found specification of procedure srand48_r [2020-08-22 22:21:16,692 INFO L130 BoogieDeclarations]: Found specification of procedure seed48_r [2020-08-22 22:21:16,692 INFO L130 BoogieDeclarations]: Found specification of procedure lcong48_r [2020-08-22 22:21:16,692 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-22 22:21:16,693 INFO L130 BoogieDeclarations]: Found specification of procedure calloc [2020-08-22 22:21:16,693 INFO L130 BoogieDeclarations]: Found specification of procedure realloc [2020-08-22 22:21:16,693 INFO L130 BoogieDeclarations]: Found specification of procedure free [2020-08-22 22:21:16,693 INFO L130 BoogieDeclarations]: Found specification of procedure cfree [2020-08-22 22:21:16,693 INFO L130 BoogieDeclarations]: Found specification of procedure alloca [2020-08-22 22:21:16,693 INFO L130 BoogieDeclarations]: Found specification of procedure valloc [2020-08-22 22:21:16,694 INFO L130 BoogieDeclarations]: Found specification of procedure posix_memalign [2020-08-22 22:21:16,694 INFO L130 BoogieDeclarations]: Found specification of procedure aligned_alloc [2020-08-22 22:21:16,694 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-22 22:21:16,694 INFO L130 BoogieDeclarations]: Found specification of procedure atexit [2020-08-22 22:21:16,695 INFO L130 BoogieDeclarations]: Found specification of procedure at_quick_exit [2020-08-22 22:21:16,695 INFO L130 BoogieDeclarations]: Found specification of procedure on_exit [2020-08-22 22:21:16,695 INFO L130 BoogieDeclarations]: Found specification of procedure exit [2020-08-22 22:21:16,696 INFO L130 BoogieDeclarations]: Found specification of procedure quick_exit [2020-08-22 22:21:16,696 INFO L130 BoogieDeclarations]: Found specification of procedure _Exit [2020-08-22 22:21:16,696 INFO L130 BoogieDeclarations]: Found specification of procedure getenv [2020-08-22 22:21:16,697 INFO L130 BoogieDeclarations]: Found specification of procedure putenv [2020-08-22 22:21:16,697 INFO L130 BoogieDeclarations]: Found specification of procedure setenv [2020-08-22 22:21:16,697 INFO L130 BoogieDeclarations]: Found specification of procedure unsetenv [2020-08-22 22:21:16,697 INFO L130 BoogieDeclarations]: Found specification of procedure clearenv [2020-08-22 22:21:16,697 INFO L130 BoogieDeclarations]: Found specification of procedure mktemp [2020-08-22 22:21:16,697 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemp [2020-08-22 22:21:16,698 INFO L130 BoogieDeclarations]: Found specification of procedure mkstemps [2020-08-22 22:21:16,699 INFO L130 BoogieDeclarations]: Found specification of procedure mkdtemp [2020-08-22 22:21:16,699 INFO L130 BoogieDeclarations]: Found specification of procedure system [2020-08-22 22:21:16,699 INFO L130 BoogieDeclarations]: Found specification of procedure realpath [2020-08-22 22:21:16,699 INFO L130 BoogieDeclarations]: Found specification of procedure bsearch [2020-08-22 22:21:16,699 INFO L130 BoogieDeclarations]: Found specification of procedure qsort [2020-08-22 22:21:16,700 INFO L130 BoogieDeclarations]: Found specification of procedure abs [2020-08-22 22:21:16,700 INFO L130 BoogieDeclarations]: Found specification of procedure labs [2020-08-22 22:21:16,700 INFO L130 BoogieDeclarations]: Found specification of procedure llabs [2020-08-22 22:21:16,701 INFO L130 BoogieDeclarations]: Found specification of procedure div [2020-08-22 22:21:16,701 INFO L130 BoogieDeclarations]: Found specification of procedure ldiv [2020-08-22 22:21:16,701 INFO L130 BoogieDeclarations]: Found specification of procedure lldiv [2020-08-22 22:21:16,701 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt [2020-08-22 22:21:16,701 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt [2020-08-22 22:21:16,701 INFO L130 BoogieDeclarations]: Found specification of procedure gcvt [2020-08-22 22:21:16,702 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt [2020-08-22 22:21:16,702 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt [2020-08-22 22:21:16,702 INFO L130 BoogieDeclarations]: Found specification of procedure qgcvt [2020-08-22 22:21:16,702 INFO L130 BoogieDeclarations]: Found specification of procedure ecvt_r [2020-08-22 22:21:16,702 INFO L130 BoogieDeclarations]: Found specification of procedure fcvt_r [2020-08-22 22:21:16,702 INFO L130 BoogieDeclarations]: Found specification of procedure qecvt_r [2020-08-22 22:21:16,703 INFO L130 BoogieDeclarations]: Found specification of procedure qfcvt_r [2020-08-22 22:21:16,703 INFO L130 BoogieDeclarations]: Found specification of procedure mblen [2020-08-22 22:21:16,703 INFO L130 BoogieDeclarations]: Found specification of procedure mbtowc [2020-08-22 22:21:16,703 INFO L130 BoogieDeclarations]: Found specification of procedure wctomb [2020-08-22 22:21:16,703 INFO L130 BoogieDeclarations]: Found specification of procedure mbstowcs [2020-08-22 22:21:16,703 INFO L130 BoogieDeclarations]: Found specification of procedure wcstombs [2020-08-22 22:21:16,703 INFO L130 BoogieDeclarations]: Found specification of procedure rpmatch [2020-08-22 22:21:16,703 INFO L130 BoogieDeclarations]: Found specification of procedure getsubopt [2020-08-22 22:21:16,704 INFO L130 BoogieDeclarations]: Found specification of procedure getloadavg [2020-08-22 22:21:16,704 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2020-08-22 22:21:16,704 INFO L130 BoogieDeclarations]: Found specification of procedure sll_create [2020-08-22 22:21:16,704 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-22 22:21:16,704 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-22 22:21:16,704 INFO L130 BoogieDeclarations]: Found specification of procedure sll_length [2020-08-22 22:21:16,704 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-22 22:21:16,705 INFO L130 BoogieDeclarations]: Found specification of procedure sll_destroy [2020-08-22 22:21:16,705 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-22 22:21:16,705 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-22 22:21:16,705 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-22 22:21:16,705 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-22 22:21:17,031 INFO L732 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2020-08-22 22:21:17,243 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-22 22:21:17,244 INFO L295 CfgBuilder]: Removed 4 assume(true) statements. [2020-08-22 22:21:17,249 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 10:21:17 BoogieIcfgContainer [2020-08-22 22:21:17,249 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-22 22:21:17,253 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-22 22:21:17,253 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-22 22:21:17,257 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-22 22:21:17,258 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.08 10:21:15" (1/3) ... [2020-08-22 22:21:17,259 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@443a333d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 10:21:17, skipping insertion in model container [2020-08-22 22:21:17,260 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.08 10:21:16" (2/3) ... [2020-08-22 22:21:17,260 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@443a333d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.08 10:21:17, skipping insertion in model container [2020-08-22 22:21:17,260 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.08 10:21:17" (3/3) ... [2020-08-22 22:21:17,262 INFO L109 eAbstractionObserver]: Analyzing ICFG sll_length_check-1.i [2020-08-22 22:21:17,274 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-22 22:21:17,285 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-22 22:21:17,301 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-22 22:21:17,335 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-22 22:21:17,336 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-22 22:21:17,337 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-22 22:21:17,337 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-22 22:21:17,338 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-22 22:21:17,339 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-22 22:21:17,347 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-22 22:21:17,347 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-22 22:21:17,374 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states. [2020-08-22 22:21:17,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-22 22:21:17,393 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:21:17,394 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:21:17,395 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:21:17,402 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:21:17,403 INFO L82 PathProgramCache]: Analyzing trace with hash 1731717969, now seen corresponding path program 1 times [2020-08-22 22:21:17,414 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:21:17,415 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1069872682] [2020-08-22 22:21:17,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:21:17,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:17,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:21:17,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:17,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-08-22 22:21:17,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:17,656 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2020-08-22 22:21:17,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:17,676 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 22:21:17,677 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1069872682] [2020-08-22 22:21:17,685 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 22:21:17,686 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-22 22:21:17,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [154828925] [2020-08-22 22:21:17,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-22 22:21:17,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:21:17,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-22 22:21:17,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-22 22:21:17,710 INFO L87 Difference]: Start difference. First operand 75 states. Second operand 4 states. [2020-08-22 22:21:18,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:21:18,012 INFO L93 Difference]: Finished difference Result 154 states and 184 transitions. [2020-08-22 22:21:18,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-22 22:21:18,014 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 29 [2020-08-22 22:21:18,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:21:18,025 INFO L225 Difference]: With dead ends: 154 [2020-08-22 22:21:18,025 INFO L226 Difference]: Without dead ends: 68 [2020-08-22 22:21:18,030 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-22 22:21:18,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-22 22:21:18,082 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 55. [2020-08-22 22:21:18,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-22 22:21:18,085 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-22 22:21:18,087 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 29 [2020-08-22 22:21:18,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:21:18,088 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-22 22:21:18,088 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-22 22:21:18,088 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-22 22:21:18,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-22 22:21:18,090 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:21:18,090 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:21:18,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-22 22:21:18,091 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:21:18,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:21:18,091 INFO L82 PathProgramCache]: Analyzing trace with hash 632987872, now seen corresponding path program 1 times [2020-08-22 22:21:18,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:21:18,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [529696851] [2020-08-22 22:21:18,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:21:18,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:18,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:21:18,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:18,177 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-08-22 22:21:18,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:18,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2020-08-22 22:21:18,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:18,203 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 22:21:18,204 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [529696851] [2020-08-22 22:21:18,204 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 22:21:18,204 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-22 22:21:18,204 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390328890] [2020-08-22 22:21:18,206 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-22 22:21:18,207 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:21:18,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-22 22:21:18,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-22 22:21:18,207 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 6 states. [2020-08-22 22:21:18,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:21:18,539 INFO L93 Difference]: Finished difference Result 143 states and 154 transitions. [2020-08-22 22:21:18,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-22 22:21:18,540 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 33 [2020-08-22 22:21:18,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:21:18,542 INFO L225 Difference]: With dead ends: 143 [2020-08-22 22:21:18,542 INFO L226 Difference]: Without dead ends: 96 [2020-08-22 22:21:18,544 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2020-08-22 22:21:18,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-22 22:21:18,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 57. [2020-08-22 22:21:18,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-22 22:21:18,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-22 22:21:18,560 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 33 [2020-08-22 22:21:18,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:21:18,560 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-22 22:21:18,560 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-22 22:21:18,561 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-22 22:21:18,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-22 22:21:18,562 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:21:18,562 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:21:18,562 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-22 22:21:18,562 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:21:18,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:21:18,563 INFO L82 PathProgramCache]: Analyzing trace with hash -1134974621, now seen corresponding path program 1 times [2020-08-22 22:21:18,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:21:18,563 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [121830047] [2020-08-22 22:21:18,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:21:18,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:18,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:21:18,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:18,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-22 22:21:18,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:18,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 24 [2020-08-22 22:21:18,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:18,705 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 22:21:18,705 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [121830047] [2020-08-22 22:21:18,705 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 22:21:18,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-08-22 22:21:18,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357331423] [2020-08-22 22:21:18,706 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-22 22:21:18,707 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:21:18,707 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-22 22:21:18,707 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-22 22:21:18,708 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 7 states. [2020-08-22 22:21:19,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:21:19,054 INFO L93 Difference]: Finished difference Result 114 states and 121 transitions. [2020-08-22 22:21:19,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-22 22:21:19,054 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 35 [2020-08-22 22:21:19,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:21:19,056 INFO L225 Difference]: With dead ends: 114 [2020-08-22 22:21:19,056 INFO L226 Difference]: Without dead ends: 94 [2020-08-22 22:21:19,057 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-08-22 22:21:19,058 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-22 22:21:19,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 67. [2020-08-22 22:21:19,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-22 22:21:19,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 73 transitions. [2020-08-22 22:21:19,075 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 73 transitions. Word has length 35 [2020-08-22 22:21:19,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:21:19,075 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 73 transitions. [2020-08-22 22:21:19,075 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-22 22:21:19,075 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 73 transitions. [2020-08-22 22:21:19,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-22 22:21:19,078 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:21:19,078 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:21:19,079 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-22 22:21:19,079 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:21:19,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:21:19,079 INFO L82 PathProgramCache]: Analyzing trace with hash 226602169, now seen corresponding path program 1 times [2020-08-22 22:21:19,080 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:21:19,080 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1563873638] [2020-08-22 22:21:19,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:21:19,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:19,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:21:19,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:19,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-08-22 22:21:19,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:19,169 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 32 [2020-08-22 22:21:19,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:19,176 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 22:21:19,177 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1563873638] [2020-08-22 22:21:19,177 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:21:19,177 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-22 22:21:19,177 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1375328271] [2020-08-22 22:21:19,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-22 22:21:19,178 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:21:19,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-22 22:21:19,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-22 22:21:19,179 INFO L87 Difference]: Start difference. First operand 67 states and 73 transitions. Second operand 8 states. [2020-08-22 22:21:19,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:21:19,677 INFO L93 Difference]: Finished difference Result 168 states and 182 transitions. [2020-08-22 22:21:19,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 22:21:19,678 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 43 [2020-08-22 22:21:19,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:21:19,679 INFO L225 Difference]: With dead ends: 168 [2020-08-22 22:21:19,680 INFO L226 Difference]: Without dead ends: 117 [2020-08-22 22:21:19,684 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2020-08-22 22:21:19,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-08-22 22:21:19,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 74. [2020-08-22 22:21:19,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-22 22:21:19,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 80 transitions. [2020-08-22 22:21:19,703 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 80 transitions. Word has length 43 [2020-08-22 22:21:19,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:21:19,704 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 80 transitions. [2020-08-22 22:21:19,704 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-22 22:21:19,704 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 80 transitions. [2020-08-22 22:21:19,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-22 22:21:19,706 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:21:19,706 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:21:19,706 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-22 22:21:19,706 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:21:19,707 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:21:19,707 INFO L82 PathProgramCache]: Analyzing trace with hash 360366586, now seen corresponding path program 1 times [2020-08-22 22:21:19,707 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:21:19,707 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2018947166] [2020-08-22 22:21:19,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:21:19,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:19,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:21:19,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:19,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-22 22:21:19,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:19,878 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-22 22:21:19,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:19,910 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 22:21:19,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2018947166] [2020-08-22 22:21:19,911 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 22:21:19,911 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [] total 12 [2020-08-22 22:21:19,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [295149660] [2020-08-22 22:21:19,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 22:21:19,912 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:21:19,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 22:21:19,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-08-22 22:21:19,913 INFO L87 Difference]: Start difference. First operand 74 states and 80 transitions. Second operand 12 states. [2020-08-22 22:21:20,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:21:20,416 INFO L93 Difference]: Finished difference Result 101 states and 108 transitions. [2020-08-22 22:21:20,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 22:21:20,416 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 44 [2020-08-22 22:21:20,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:21:20,420 INFO L225 Difference]: With dead ends: 101 [2020-08-22 22:21:20,420 INFO L226 Difference]: Without dead ends: 96 [2020-08-22 22:21:20,421 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=281, Unknown=0, NotChecked=0, Total=342 [2020-08-22 22:21:20,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-22 22:21:20,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 81. [2020-08-22 22:21:20,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-22 22:21:20,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 89 transitions. [2020-08-22 22:21:20,443 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 89 transitions. Word has length 44 [2020-08-22 22:21:20,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:21:20,443 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 89 transitions. [2020-08-22 22:21:20,443 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 22:21:20,444 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 89 transitions. [2020-08-22 22:21:20,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-22 22:21:20,445 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:21:20,446 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:21:20,446 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-22 22:21:20,446 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:21:20,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:21:20,446 INFO L82 PathProgramCache]: Analyzing trace with hash -829611268, now seen corresponding path program 1 times [2020-08-22 22:21:20,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:21:20,447 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1852719073] [2020-08-22 22:21:20,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:21:20,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:20,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:21:20,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:20,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-22 22:21:20,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:20,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 34 [2020-08-22 22:21:20,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:20,590 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-22 22:21:20,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1852719073] [2020-08-22 22:21:20,591 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-22 22:21:20,591 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-08-22 22:21:20,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061777150] [2020-08-22 22:21:20,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 22:21:20,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:21:20,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 22:21:20,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-08-22 22:21:20,596 INFO L87 Difference]: Start difference. First operand 81 states and 89 transitions. Second operand 9 states. [2020-08-22 22:21:21,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:21:21,006 INFO L93 Difference]: Finished difference Result 117 states and 124 transitions. [2020-08-22 22:21:21,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-22 22:21:21,007 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 45 [2020-08-22 22:21:21,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:21:21,008 INFO L225 Difference]: With dead ends: 117 [2020-08-22 22:21:21,008 INFO L226 Difference]: Without dead ends: 87 [2020-08-22 22:21:21,012 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=67, Invalid=173, Unknown=0, NotChecked=0, Total=240 [2020-08-22 22:21:21,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-22 22:21:21,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 69. [2020-08-22 22:21:21,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-22 22:21:21,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 73 transitions. [2020-08-22 22:21:21,036 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 73 transitions. Word has length 45 [2020-08-22 22:21:21,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:21:21,036 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 73 transitions. [2020-08-22 22:21:21,037 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 22:21:21,037 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 73 transitions. [2020-08-22 22:21:21,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-22 22:21:21,038 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:21:21,038 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:21:21,039 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-22 22:21:21,043 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:21:21,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:21:21,043 INFO L82 PathProgramCache]: Analyzing trace with hash -642872939, now seen corresponding path program 1 times [2020-08-22 22:21:21,043 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:21:21,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [33820097] [2020-08-22 22:21:21,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:21:21,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:21,116 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:21:21,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:21,131 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-22 22:21:21,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:21,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 33 [2020-08-22 22:21:21,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:21,198 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 22:21:21,199 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [33820097] [2020-08-22 22:21:21,199 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:21:21,199 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-22 22:21:21,199 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103071959] [2020-08-22 22:21:21,201 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-22 22:21:21,201 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:21:21,201 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-22 22:21:21,202 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-08-22 22:21:21,202 INFO L87 Difference]: Start difference. First operand 69 states and 73 transitions. Second operand 9 states. [2020-08-22 22:21:21,534 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:21:21,534 INFO L93 Difference]: Finished difference Result 120 states and 127 transitions. [2020-08-22 22:21:21,536 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-22 22:21:21,536 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 51 [2020-08-22 22:21:21,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:21:21,538 INFO L225 Difference]: With dead ends: 120 [2020-08-22 22:21:21,538 INFO L226 Difference]: Without dead ends: 99 [2020-08-22 22:21:21,538 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2020-08-22 22:21:21,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-08-22 22:21:21,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 84. [2020-08-22 22:21:21,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-22 22:21:21,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 90 transitions. [2020-08-22 22:21:21,560 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 90 transitions. Word has length 51 [2020-08-22 22:21:21,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:21:21,561 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 90 transitions. [2020-08-22 22:21:21,561 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-22 22:21:21,561 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 90 transitions. [2020-08-22 22:21:21,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-22 22:21:21,562 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:21:21,563 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:21:21,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-22 22:21:21,563 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:21:21,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:21:21,564 INFO L82 PathProgramCache]: Analyzing trace with hash 1372689452, now seen corresponding path program 2 times [2020-08-22 22:21:21,564 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:21:21,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2023955956] [2020-08-22 22:21:21,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:21:21,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:21,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:21:21,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:21,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-22 22:21:21,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:21,701 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 42 [2020-08-22 22:21:21,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:21,713 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 22:21:21,713 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2023955956] [2020-08-22 22:21:21,714 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:21:21,714 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 22:21:21,714 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084419572] [2020-08-22 22:21:21,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 22:21:21,715 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:21:21,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 22:21:21,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2020-08-22 22:21:21,716 INFO L87 Difference]: Start difference. First operand 84 states and 90 transitions. Second operand 11 states. [2020-08-22 22:21:22,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:21:22,080 INFO L93 Difference]: Finished difference Result 132 states and 140 transitions. [2020-08-22 22:21:22,080 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 22:21:22,080 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 60 [2020-08-22 22:21:22,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:21:22,082 INFO L225 Difference]: With dead ends: 132 [2020-08-22 22:21:22,082 INFO L226 Difference]: Without dead ends: 111 [2020-08-22 22:21:22,083 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2020-08-22 22:21:22,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2020-08-22 22:21:22,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 93. [2020-08-22 22:21:22,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-22 22:21:22,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 100 transitions. [2020-08-22 22:21:22,100 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 100 transitions. Word has length 60 [2020-08-22 22:21:22,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:21:22,100 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 100 transitions. [2020-08-22 22:21:22,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 22:21:22,100 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 100 transitions. [2020-08-22 22:21:22,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-22 22:21:22,102 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:21:22,102 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:21:22,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-22 22:21:22,103 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:21:22,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:21:22,103 INFO L82 PathProgramCache]: Analyzing trace with hash -1521110738, now seen corresponding path program 1 times [2020-08-22 22:21:22,103 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:21:22,103 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1476760567] [2020-08-22 22:21:22,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:21:22,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:22,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:21:22,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:22,193 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-22 22:21:22,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:22,258 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 43 [2020-08-22 22:21:22,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:22,267 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-08-22 22:21:22,267 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1476760567] [2020-08-22 22:21:22,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:21:22,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-22 22:21:22,273 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547820333] [2020-08-22 22:21:22,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-22 22:21:22,274 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:21:22,275 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-22 22:21:22,276 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-08-22 22:21:22,276 INFO L87 Difference]: Start difference. First operand 93 states and 100 transitions. Second operand 11 states. [2020-08-22 22:21:22,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:21:22,742 INFO L93 Difference]: Finished difference Result 125 states and 132 transitions. [2020-08-22 22:21:22,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-22 22:21:22,743 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 61 [2020-08-22 22:21:22,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:21:22,744 INFO L225 Difference]: With dead ends: 125 [2020-08-22 22:21:22,744 INFO L226 Difference]: Without dead ends: 101 [2020-08-22 22:21:22,748 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=79, Invalid=301, Unknown=0, NotChecked=0, Total=380 [2020-08-22 22:21:22,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2020-08-22 22:21:22,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 93. [2020-08-22 22:21:22,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-22 22:21:22,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 99 transitions. [2020-08-22 22:21:22,784 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 99 transitions. Word has length 61 [2020-08-22 22:21:22,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:21:22,785 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 99 transitions. [2020-08-22 22:21:22,785 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-22 22:21:22,785 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 99 transitions. [2020-08-22 22:21:22,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-22 22:21:22,786 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:21:22,786 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:21:22,787 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-22 22:21:22,787 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:21:22,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:21:22,787 INFO L82 PathProgramCache]: Analyzing trace with hash 1187742581, now seen corresponding path program 3 times [2020-08-22 22:21:22,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:21:22,788 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1333214657] [2020-08-22 22:21:22,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:21:22,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:22,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:21:22,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:22,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-22 22:21:22,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:22,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2020-08-22 22:21:22,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:23,024 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 20 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-08-22 22:21:23,024 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1333214657] [2020-08-22 22:21:23,024 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:21:23,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-22 22:21:23,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [220993819] [2020-08-22 22:21:23,025 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-22 22:21:23,025 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:21:23,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-22 22:21:23,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-22 22:21:23,026 INFO L87 Difference]: Start difference. First operand 93 states and 99 transitions. Second operand 17 states. [2020-08-22 22:21:23,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:21:23,930 INFO L93 Difference]: Finished difference Result 113 states and 119 transitions. [2020-08-22 22:21:23,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-22 22:21:23,932 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 69 [2020-08-22 22:21:23,933 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:21:23,934 INFO L225 Difference]: With dead ends: 113 [2020-08-22 22:21:23,934 INFO L226 Difference]: Without dead ends: 105 [2020-08-22 22:21:23,936 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=163, Invalid=893, Unknown=0, NotChecked=0, Total=1056 [2020-08-22 22:21:23,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2020-08-22 22:21:23,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 100. [2020-08-22 22:21:23,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2020-08-22 22:21:23,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 106 transitions. [2020-08-22 22:21:23,953 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 106 transitions. Word has length 69 [2020-08-22 22:21:23,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:21:23,955 INFO L479 AbstractCegarLoop]: Abstraction has 100 states and 106 transitions. [2020-08-22 22:21:23,955 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-22 22:21:23,955 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 106 transitions. [2020-08-22 22:21:23,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-22 22:21:23,957 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:21:23,957 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:21:23,957 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-22 22:21:23,958 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:21:23,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:21:23,958 INFO L82 PathProgramCache]: Analyzing trace with hash 979580858, now seen corresponding path program 4 times [2020-08-22 22:21:23,958 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:21:23,958 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [521392353] [2020-08-22 22:21:23,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:21:23,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:24,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:21:24,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:24,080 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2020-08-22 22:21:24,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:24,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 51 [2020-08-22 22:21:24,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:24,224 INFO L134 CoverageAnalysis]: Checked inductivity of 39 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2020-08-22 22:21:24,224 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [521392353] [2020-08-22 22:21:24,225 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:21:24,225 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-22 22:21:24,225 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101807564] [2020-08-22 22:21:24,226 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-22 22:21:24,226 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:21:24,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-22 22:21:24,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=111, Unknown=0, NotChecked=0, Total=132 [2020-08-22 22:21:24,227 INFO L87 Difference]: Start difference. First operand 100 states and 106 transitions. Second operand 12 states. [2020-08-22 22:21:24,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:21:24,828 INFO L93 Difference]: Finished difference Result 125 states and 132 transitions. [2020-08-22 22:21:24,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-22 22:21:24,828 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 76 [2020-08-22 22:21:24,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:21:24,830 INFO L225 Difference]: With dead ends: 125 [2020-08-22 22:21:24,830 INFO L226 Difference]: Without dead ends: 120 [2020-08-22 22:21:24,833 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-08-22 22:21:24,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-08-22 22:21:24,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 113. [2020-08-22 22:21:24,855 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-08-22 22:21:24,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 121 transitions. [2020-08-22 22:21:24,857 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 121 transitions. Word has length 76 [2020-08-22 22:21:24,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:21:24,857 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 121 transitions. [2020-08-22 22:21:24,857 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-22 22:21:24,857 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 121 transitions. [2020-08-22 22:21:24,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-22 22:21:24,859 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:21:24,859 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:21:24,859 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-22 22:21:24,859 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:21:24,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:21:24,860 INFO L82 PathProgramCache]: Analyzing trace with hash -446623556, now seen corresponding path program 2 times [2020-08-22 22:21:24,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:21:24,861 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [4647430] [2020-08-22 22:21:24,861 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:21:24,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:24,924 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-22 22:21:24,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:24,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 25 [2020-08-22 22:21:24,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:25,045 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 52 [2020-08-22 22:21:25,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-22 22:21:25,056 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 5 proven. 11 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-08-22 22:21:25,056 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [4647430] [2020-08-22 22:21:25,056 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-22 22:21:25,057 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-22 22:21:25,057 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1890725192] [2020-08-22 22:21:25,057 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-22 22:21:25,058 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-22 22:21:25,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-22 22:21:25,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=128, Unknown=0, NotChecked=0, Total=156 [2020-08-22 22:21:25,059 INFO L87 Difference]: Start difference. First operand 113 states and 121 transitions. Second operand 13 states. [2020-08-22 22:21:25,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-22 22:21:25,524 INFO L93 Difference]: Finished difference Result 163 states and 171 transitions. [2020-08-22 22:21:25,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-22 22:21:25,524 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 77 [2020-08-22 22:21:25,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-22 22:21:25,526 INFO L225 Difference]: With dead ends: 163 [2020-08-22 22:21:25,526 INFO L226 Difference]: Without dead ends: 122 [2020-08-22 22:21:25,527 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=105, Invalid=447, Unknown=0, NotChecked=0, Total=552 [2020-08-22 22:21:25,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-08-22 22:21:25,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 110. [2020-08-22 22:21:25,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2020-08-22 22:21:25,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 117 transitions. [2020-08-22 22:21:25,545 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 117 transitions. Word has length 77 [2020-08-22 22:21:25,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-22 22:21:25,545 INFO L479 AbstractCegarLoop]: Abstraction has 110 states and 117 transitions. [2020-08-22 22:21:25,545 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-22 22:21:25,546 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 117 transitions. [2020-08-22 22:21:25,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-22 22:21:25,547 INFO L414 BasicCegarLoop]: Found error trace [2020-08-22 22:21:25,547 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-22 22:21:25,547 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-22 22:21:25,548 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-22 22:21:25,548 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-22 22:21:25,548 INFO L82 PathProgramCache]: Analyzing trace with hash -1305863211, now seen corresponding path program 5 times [2020-08-22 22:21:25,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-22 22:21:25,549 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [160508617] [2020-08-22 22:21:25,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-22 22:21:25,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 22:21:25,572 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 22:21:25,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-08-22 22:21:25,599 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-08-22 22:21:25,643 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-08-22 22:21:25,643 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-08-22 22:21:25,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-22 22:21:25,729 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.08 10:21:25 BoogieIcfgContainer [2020-08-22 22:21:25,729 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-22 22:21:25,732 INFO L168 Benchmark]: Toolchain (without parser) took 9856.06 ms. Allocated memory was 139.5 MB in the beginning and 329.3 MB in the end (delta: 189.8 MB). Free memory was 102.6 MB in the beginning and 182.7 MB in the end (delta: -80.0 MB). Peak memory consumption was 109.8 MB. Max. memory is 7.1 GB. [2020-08-22 22:21:25,733 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 139.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. [2020-08-22 22:21:25,734 INFO L168 Benchmark]: CACSL2BoogieTranslator took 628.11 ms. Allocated memory was 139.5 MB in the beginning and 205.0 MB in the end (delta: 65.5 MB). Free memory was 102.4 MB in the beginning and 169.3 MB in the end (delta: -66.8 MB). Peak memory consumption was 23.4 MB. Max. memory is 7.1 GB. [2020-08-22 22:21:25,734 INFO L168 Benchmark]: Boogie Preprocessor took 71.62 ms. Allocated memory is still 205.0 MB. Free memory was 169.3 MB in the beginning and 166.5 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 7.1 GB. [2020-08-22 22:21:25,735 INFO L168 Benchmark]: RCFGBuilder took 672.09 ms. Allocated memory is still 205.0 MB. Free memory was 166.5 MB in the beginning and 120.6 MB in the end (delta: 45.9 MB). Peak memory consumption was 45.9 MB. Max. memory is 7.1 GB. [2020-08-22 22:21:25,736 INFO L168 Benchmark]: TraceAbstraction took 8476.18 ms. Allocated memory was 205.0 MB in the beginning and 329.3 MB in the end (delta: 124.3 MB). Free memory was 120.0 MB in the beginning and 182.7 MB in the end (delta: -62.7 MB). Peak memory consumption was 61.6 MB. Max. memory is 7.1 GB. [2020-08-22 22:21:25,739 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 139.5 MB. Free memory was 122.0 MB in the beginning and 121.8 MB in the end (delta: 209.8 kB). Peak memory consumption was 209.8 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 628.11 ms. Allocated memory was 139.5 MB in the beginning and 205.0 MB in the end (delta: 65.5 MB). Free memory was 102.4 MB in the beginning and 169.3 MB in the end (delta: -66.8 MB). Peak memory consumption was 23.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 71.62 ms. Allocated memory is still 205.0 MB. Free memory was 169.3 MB in the beginning and 166.5 MB in the end (delta: 2.7 MB). Peak memory consumption was 2.7 MB. Max. memory is 7.1 GB. * RCFGBuilder took 672.09 ms. Allocated memory is still 205.0 MB. Free memory was 166.5 MB in the beginning and 120.6 MB in the end (delta: 45.9 MB). Peak memory consumption was 45.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 8476.18 ms. Allocated memory was 205.0 MB in the beginning and 329.3 MB in the end (delta: 124.3 MB). Free memory was 120.0 MB in the beginning and 182.7 MB in the end (delta: -62.7 MB). Peak memory consumption was 61.6 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 602]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L592] int len = 2; VAL [len=2] [L593] len < 32 && __VERIFIER_nondet_int() VAL [len=2, len < 32 && __VERIFIER_nondet_int()=1] [L593] len < 32 && __VERIFIER_nondet_int() VAL [__VERIFIER_nondet_int()=0, len=2, len < 32 && __VERIFIER_nondet_int()=0] [L593] COND FALSE !(len < 32 && __VERIFIER_nondet_int()) VAL [__VERIFIER_nondet_int()=0, len=2, len < 32 && __VERIFIER_nondet_int()=0] [L596] CALL, EXPR sll_create(len + 1) VAL [\old(len)=3] [L564] SLL head = ((void *)0); VAL [\old(len)=3, head={0:0}, len=3] [L565] COND TRUE len > 0 VAL [\old(len)=3, head={0:0}, len=3] [L566] SLL new_head = (SLL) malloc(sizeof(struct node)); VAL [\old(len)=3, head={0:0}, len=3, malloc(sizeof(struct node))={-1:0}, new_head={-1:0}] [L567] COND FALSE !(((void *)0) == new_head) VAL [\old(len)=3, head={0:0}, len=3, malloc(sizeof(struct node))={-1:0}, new_head={-1:0}] [L570] new_head->next = head VAL [\old(len)=3, head={0:0}, len=3, malloc(sizeof(struct node))={-1:0}, new_head={-1:0}] [L571] head = new_head VAL [\old(len)=3, head={-1:0}, len=3, malloc(sizeof(struct node))={-1:0}, new_head={-1:0}] [L572] len-- VAL [\old(len)=3, head={-1:0}, len=2, malloc(sizeof(struct node))={-1:0}, new_head={-1:0}] [L565] COND TRUE len > 0 VAL [\old(len)=3, head={-1:0}, len=2, malloc(sizeof(struct node))={-1:0}, new_head={-1:0}] [L566] SLL new_head = (SLL) malloc(sizeof(struct node)); VAL [\old(len)=3, head={-1:0}, len=2, malloc(sizeof(struct node))={-2:0}, new_head={-2:0}] [L567] COND FALSE !(((void *)0) == new_head) VAL [\old(len)=3, head={-1:0}, len=2, malloc(sizeof(struct node))={-2:0}, new_head={-2:0}] [L570] new_head->next = head VAL [\old(len)=3, head={-1:0}, len=2, malloc(sizeof(struct node))={-2:0}, new_head={-2:0}] [L571] head = new_head VAL [\old(len)=3, head={-2:0}, len=2, malloc(sizeof(struct node))={-2:0}, new_head={-2:0}] [L572] len-- VAL [\old(len)=3, head={-2:0}, len=1, malloc(sizeof(struct node))={-2:0}, new_head={-2:0}] [L565] COND TRUE len > 0 VAL [\old(len)=3, head={-2:0}, len=1, malloc(sizeof(struct node))={-2:0}, new_head={-2:0}] [L566] SLL new_head = (SLL) malloc(sizeof(struct node)); VAL [\old(len)=3, head={-2:0}, len=1, malloc(sizeof(struct node))={-3:0}, new_head={-3:0}] [L567] COND FALSE !(((void *)0) == new_head) VAL [\old(len)=3, head={-2:0}, len=1, malloc(sizeof(struct node))={-3:0}, new_head={-3:0}] [L570] new_head->next = head VAL [\old(len)=3, head={-2:0}, len=1, malloc(sizeof(struct node))={-3:0}, new_head={-3:0}] [L571] head = new_head VAL [\old(len)=3, head={-3:0}, len=1, malloc(sizeof(struct node))={-3:0}, new_head={-3:0}] [L572] len-- VAL [\old(len)=3, head={-3:0}, len=0, malloc(sizeof(struct node))={-3:0}, new_head={-3:0}] [L565] COND FALSE !(len > 0) VAL [\old(len)=3, head={-3:0}, len=0, malloc(sizeof(struct node))={-3:0}, new_head={-3:0}] [L574] return head; VAL [\old(len)=3, \result={-3:0}, head={-3:0}, len=0, malloc(sizeof(struct node))={-3:0}, new_head={-3:0}] [L596] RET, EXPR sll_create(len + 1) VAL [len=2, sll_create(len + 1)={-3:0}] [L596] SLL s = sll_create(len + 1); VAL [len=2, s={-3:0}, sll_create(len + 1)={-3:0}] [L597] CALL, EXPR sll_length(s) VAL [head={-3:0}] [L577] int len = 0; VAL [head={-3:0}, head={-3:0}, len=0] [L578] COND TRUE \read(head) VAL [head={-3:0}, head={-3:0}, len=0] [L579] len++ VAL [head={-3:0}, head={-3:0}, len=1] [L580] EXPR head->next VAL [head={-3:0}, head={-3:0}, head->next={-2:0}, len=1] [L580] head = head->next VAL [head={-3:0}, head={-2:0}, head->next={-2:0}, len=1] [L578] COND TRUE \read(head) VAL [head={-2:0}, head={-3:0}, len=1] [L579] len++ VAL [head={-3:0}, head={-2:0}, len=2] [L580] EXPR head->next VAL [head={-2:0}, head={-3:0}, head->next={-1:0}, len=2] [L580] head = head->next VAL [head={-3:0}, head={-1:0}, head->next={-1:0}, len=2] [L578] COND TRUE \read(head) VAL [head={-1:0}, head={-3:0}, len=2] [L579] len++ VAL [head={-3:0}, head={-1:0}, len=3] [L580] EXPR head->next VAL [head={-3:0}, head={-1:0}, head->next={0:0}, len=3] [L580] head = head->next VAL [head={0:0}, head={-3:0}, head->next={0:0}, len=3] [L578] COND FALSE !(\read(head)) VAL [head={0:0}, head={-3:0}, len=3] [L582] return len; VAL [\result=3, head={-3:0}, head={0:0}, len=3] [L597] RET, EXPR sll_length(s) VAL [len=2, s={-3:0}, sll_length(s)=3] [L597] COND TRUE len != sll_length(s) VAL [len=2, s={-3:0}, sll_length(s)=3] [L602] __VERIFIER_error() VAL [len=2, s={-3:0}] - StatisticsResult: Ultimate Automizer benchmark data CFG has 9 procedures, 86 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 8.3s, OverallIterations: 13, TraceHistogramMax: 3, AutomataDifference: 5.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 704 SDtfs, 1517 SDslu, 1614 SDs, 0 SdLazy, 3558 SolverSat, 235 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 266 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 188 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 353 ImplicationChecksByTransitivity, 2.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=113occurred in iteration=11, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 12 MinimizatonAttempts, 220 StatesRemovedByMinimization, 12 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.7s InterpolantComputationTime, 706 NumberOfCodeBlocks, 706 NumberOfCodeBlocksAsserted, 13 NumberOfCheckSat, 611 ConstructedInterpolants, 0 QuantifiedInterpolants, 101481 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 12 InterpolantComputations, 5 PerfectInterpolantSequences, 81/125 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 RESULT: Ultimate proved your program to be incorrect! Received shutdown request...