/export/starexec/sandbox/solver/bin/starexec_run_c /export/starexec/sandbox/benchmark/theBenchmark.c /export/starexec/sandbox/output/output_files


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NO
proof of /export/starexec/sandbox/benchmark/theBenchmark.c
# AProVE Commit ID: 48fb2092695e11cc9f56e44b17a92a5f88ffb256 marcel 20180622 unpublished dirty


Termination of the given C Problem could be disproven:

(0) C Problem
(1) CToLLVMProof [EQUIVALENT, 128 ms]
(2) LLVM problem
(3) LLVMToTerminationGraphProof [EQUIVALENT, 449 ms]
(4) LLVM Symbolic Execution Graph
(5) LLVMNonterminationProof [COMPLETE, 53 ms]
(6) NO


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(0)
Obligation:
c file /export/starexec/sandbox/benchmark/theBenchmark.c
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(1) CToLLVMProof (EQUIVALENT)
Compiled c-file /export/starexec/sandbox/benchmark/theBenchmark.c to LLVM.
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(2)
Obligation:
LLVM Problem

Aliases:

Data layout:

"e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"

Machine:

"x86_64-pc-linux-gnu"

Type definitions:

Global variables:

Function declarations and definitions:

*BasicFunctionTypename: "__VERIFIER_nondet_int" returnParam: i32 parameters: () variableLength: true visibilityType: DEFAULT callingConvention: ccc
*BasicFunctionTypename: "main" linkageType: EXTERNALLY_VISIBLE returnParam: i32 parameters: () variableLength: false visibilityType: DEFAULT callingConvention: ccc
	0:
		%1 = alloca i32, align 4
		%x = alloca i32, align 4
		%y = alloca i32, align 4
		%old_x = alloca i32, align 4
		store 0, %1
		%2 = call i32 (...)* @__VERIFIER_nondet_int()
		store %2, %x
		%3 = call i32 (...)* @__VERIFIER_nondet_int()
		store %3, %y
		br %4
	4:
		%5 = load %x
		store %5, %old_x
		%6 = load %y
		%7 = sub 0 %6
		store %7, %x
		%8 = load %old_x
		store %8, %y
		br %4
	9:
		%10 = load %1
		ret %10


Analyze Termination of all function calls matching the pattern:
main()
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(3) LLVMToTerminationGraphProof (EQUIVALENT)
Constructed symbolic execution graph for LLVM program and proved memory safety.
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(4)
Obligation:
SE Graph
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(5) LLVMNonterminationProof (COMPLETE)
Proved nontermination with the following witness:

State #63 with references set to {}.
Nondeterministic instruction %1 = alloca i32, align 4 in node #63 yields value 9.
Nondeterministic instruction %x = alloca i32, align 4 in node #64 yields value 5.
Nondeterministic instruction %y = alloca i32, align 4 in node #65 yields value 16.
Nondeterministic instruction %old_x = alloca i32, align 4 in node #66 yields value 1.
Nondeterministic instruction %2 = call i32 (...)* @__VERIFIER_nondet_int() in node #68 yields value 0.
Nondeterministic instruction %3 = call i32 (...)* @__VERIFIER_nondet_int() in node #70 yields value 7.

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(6)
NO