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PE with ref head (single-value) rule can panic #6027

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srenatus opened this issue Jun 19, 2023 · 0 comments · Fixed by #6028
Closed

PE with ref head (single-value) rule can panic #6027

srenatus opened this issue Jun 19, 2023 · 0 comments · Fixed by #6028
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@srenatus
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package test

foo.bar[baz] {
    baz := "baz"
}

main := foo[input.bar][input.baz]

Running PE with shallow inlining on will produce a result:

$ opa eval -fpretty --partial --shallow-inlining -d test.rego data.test.main
+-----------+-----------------------------------------------------------------+
| Query 1   | data.partial.test.main = _term_0_0                              |
|           | _term_0_0                                                       |
+-----------+-----------------------------------------------------------------+
| Support 1 | package partial.test.foo                                        |
|           |                                                                 |
|           |  = true                                                         |
+-----------+-----------------------------------------------------------------+
| Support 2 | package partial.test                                            |
|           |                                                                 |
|           | main = __local1__1 {                                            |
|           |   __local2__1 = input.bar                                       |
|           |   __local3__1 = input.baz                                       |
|           |   "bar" = __local2__1                                           |
|           |   data.partial.test.foo[__local2__1][__local3__1] = __local1__1 |
|           | }                                                               |
+-----------+-----------------------------------------------------------------+

However, with inlininig done, we'll get a panic:

$  opa eval -fpretty --partial -d test.rego data.test.main                   
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x10055c618]

goroutine 1 [running]:
github.com/open-policy-agent/opa/topdown.(*bindings).apply(0xc00033bd30?, 0x10055da91?)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/bindings.go:144 +0x18
github.com/open-policy-agent/opa/topdown.(*eval).biunify(0xc0001eee00, 0xc00033bc28?, 0x1005aa3ea?, 0xa?, 0xc000185b90?, 0xc00033bc28?)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:847 +0x4b
github.com/open-policy-agent/opa/topdown.evalVirtualPartial.evalOneRulePostUnify.func1(0xc0001ef000)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:2521 +0x155
github.com/open-policy-agent/opa/topdown.(*eval).evalExpr(0xc0001ef000, 0xc000190cf0)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:318 +0x117
github.com/open-policy-agent/opa/topdown.(*eval).next(...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:168
github.com/open-policy-agent/opa/topdown.(*eval).evalExpr.func1(0xc0001ef000)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:343 +0x29
github.com/open-policy-agent/opa/topdown.(*eval).evalStep.func1()
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:363 +0x39
github.com/open-policy-agent/opa/topdown.(*eval).biunifyValues(0xc0001ef000, 0xc0001857a0, 0xc0001857d0, 0xc000192b70, 0xc000192b70, 0xc000192ba0)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:1000 +0x46d
github.com/open-policy-agent/opa/topdown.(*eval).biunify(0xc0001ef000, 0xc00033bea8?, 0x10000ff27?, 0x28?, 0x1017e7a00?, 0x1?)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:854 +0x17e
github.com/open-policy-agent/opa/topdown.(*eval).unify(0xc000185b00?, 0x10187b120?, 0x10000fb4a?, 0xc00033bf88?)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:843 +0x26
github.com/open-policy-agent/opa/topdown.(*eval).evalStep(0xc0001ef000, 0xc000713800)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:361 +0x5f9
github.com/open-policy-agent/opa/topdown.(*eval).evalExpr(0xc0001ef000, 0xc000190cf0)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:342 +0xec
github.com/open-policy-agent/opa/topdown.(*eval).eval(...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:305
github.com/open-policy-agent/opa/topdown.evalVirtualPartial.evalOneRulePostUnify({0xc0001eee00, {0xc000182180, 0x5, 0x6}, {0xc0001926f0, 0x5, 0x5}, 0x3, 0xc000405f40, 0xc000192420, ...}, ...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:2514 +0x32f
github.com/open-policy-agent/opa/topdown.evalVirtualPartial.evalEachRule({0xc0001eee00, {0xc000182180, 0x5, 0x6}, {0xc0001926f0, 0x5, 0x5}, 0x3, 0xc000405f40, 0xc000192420, ...}, ...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:2358 +0x405
github.com/open-policy-agent/opa/topdown.evalVirtualPartial.eval({0xc0001eee00, {0xc000182180, 0x5, 0x6}, {0xc0001926f0, 0x5, 0x5}, 0x3, 0xc000405f40, 0xc000192420, ...}, ...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:2351 +0x268
github.com/open-policy-agent/opa/topdown.evalVirtual.eval({0xc0001eee00, {0xc000182180, 0x5, 0x6}, {0xc0001926f0, 0x5, 0x5}, 0x3, 0xc000192420, 0xc0001858f0, ...}, ...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:2312 +0x2c5
github.com/open-policy-agent/opa/topdown.evalTree.next({0xc0001eee00, {0xc000182180, 0x5, 0x6}, {0xc0001926f0, 0x5, 0x5}, 0x3, 0xc000192420, 0xc0001858f0, ...}, ...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:2102 +0x2be
github.com/open-policy-agent/opa/topdown.evalTree.enumerate.func4()
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:2162 +0x3b
github.com/open-policy-agent/opa/topdown.(*eval).saveUnify(0xc0001eee00, 0xc000192840, 0xc000185b00, 0xc000192420, 0xc000192420, 0xc00005d380)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:1360 +0x353
github.com/open-policy-agent/opa/topdown.(*eval).biunifyValues(0xc0001eee00, 0xc000192840, 0xc000185b00, 0xc000192420, 0xc000192420, 0xc00005d380)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:975 +0x22d
github.com/open-policy-agent/opa/topdown.(*eval).biunify(0xc0001eee00, 0xc0001926f0?, 0x3?, 0x5?, 0xc000185b01?, 0x103400108?)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:873 +0x2fd
github.com/open-policy-agent/opa/topdown.evalTree.enumerate({0xc0001eee00, {0xc000182180, 0x5, 0x6}, {0xc0001926f0, 0x5, 0x5}, 0x3, 0xc000192420, 0xc0001858f0, ...}, ...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:2161 +0x51f
github.com/open-policy-agent/opa/topdown.evalTree.eval({0xc0001eee00, {0xc000182180, 0x5, 0x6}, {0xc0001926f0, 0x5, 0x5}, 0x3, 0xc000192420, 0xc0001858f0, ...}, ...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:2058 +0xfd
github.com/open-policy-agent/opa/topdown.evalTree.next({0xc0001eee00, {0xc000182180, 0x5, 0x6}, {0xc0001926f0, 0x5, 0x5}, 0x2, 0xc000192420, 0xc0001858f0, ...}, ...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:2108 +0x305
github.com/open-policy-agent/opa/topdown.evalTree.eval({0xc0001eee00, {0xc000182180, 0x5, 0x6}, {0xc0001926f0, 0x5, 0x5}, 0x2, 0xc000192420, 0xc0001858f0, ...}, ...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:2055 +0xc5
github.com/open-policy-agent/opa/topdown.evalTree.next({0xc0001eee00, {0xc000182180, 0x5, 0x6}, {0xc0001926f0, 0x5, 0x5}, 0x1, 0xc000192420, 0xc0001858f0, ...}, ...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:2108 +0x305
github.com/open-policy-agent/opa/topdown.evalTree.eval({0xc0001eee00, {0xc000182180, 0x5, 0x6}, {0xc0001926f0, 0x5, 0x5}, 0x1, 0xc000192420, 0xc0001858f0, ...}, ...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:2055 +0xc5
github.com/open-policy-agent/opa/topdown.(*eval).biunifyRef(0xc0001eee00, 0x101ca3820?, 0xc0001858f0, 0xc000192420, 0xc000192420, 0x100017f90?)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:1042 +0x405
github.com/open-policy-agent/opa/topdown.(*eval).biunifyValues(0xc0001eee00, 0xc0001858f0, 0xc000185ad0, 0xc000192420, 0xc000192420, 0xc0001926c0)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:969 +0x1e6
github.com/open-policy-agent/opa/topdown.(*eval).biunify(0xc0001eee00, 0xc00033d088?, 0x10000ff27?, 0x28?, 0x1017e7a00?, 0x101790701?)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:854 +0x17e
github.com/open-policy-agent/opa/topdown.(*eval).unify(0x1018413c0?, 0x10187b120?, 0x100017f90?, 0xc00033d168?)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:843 +0x26
github.com/open-policy-agent/opa/topdown.(*eval).evalStep(0xc0001eee00, 0xc0007136f0)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:361 +0x5f9
github.com/open-policy-agent/opa/topdown.(*eval).evalExpr(0xc0001eee00, 0xc00005d300)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:342 +0xec
github.com/open-policy-agent/opa/topdown.(*eval).next(...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:168
github.com/open-policy-agent/opa/topdown.(*eval).evalExpr.func1(0xc0001eee00)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:343 +0x29
github.com/open-policy-agent/opa/topdown.(*eval).evalStep.func1()
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:363 +0x39
github.com/open-policy-agent/opa/topdown.(*eval).saveUnify(0xc0001eee00, 0xc000185b90, 0xc000185aa0, 0xc000192420, 0xc000192420, 0xc0001925a0)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:1360 +0x353
github.com/open-policy-agent/opa/topdown.(*eval).biunifyValues(0xc0001eee00, 0xc000185b90, 0xc000185aa0, 0xc000192420, 0xc000192420, 0xc0001925a0)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:975 +0x22d
github.com/open-policy-agent/opa/topdown.(*eval).biunify(0xc0001eee00, 0xc00033d508?, 0x10000ff27?, 0x28?, 0x1017e7a00?, 0x1004a8f01?)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:854 +0x17e
github.com/open-policy-agent/opa/topdown.(*eval).unify(0x1018413c0?, 0x10187b120?, 0x100017f90?, 0xc00033d5e8?)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:843 +0x26
github.com/open-policy-agent/opa/topdown.(*eval).evalStep(0xc0001eee00, 0xc0007136a0)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:361 +0x5f9
github.com/open-policy-agent/opa/topdown.(*eval).evalExpr(0xc0001eee00, 0xc00005d300)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:342 +0xec
github.com/open-policy-agent/opa/topdown.(*eval).next(...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:168
github.com/open-policy-agent/opa/topdown.(*eval).evalExpr.func1(0xc0001eee00)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:343 +0x29
github.com/open-policy-agent/opa/topdown.(*eval).evalStep.func1()
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:363 +0x39
github.com/open-policy-agent/opa/topdown.(*eval).saveUnify(0xc0001eee00, 0xc000185b00, 0xc000185a10, 0xc000192420, 0xc000192420, 0xc0001924b0)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:1360 +0x353
github.com/open-policy-agent/opa/topdown.(*eval).biunifyValues(0xc0001eee00, 0xc000185b00, 0xc000185a10, 0xc000192420, 0xc000192420, 0xc0001924b0)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:975 +0x22d
github.com/open-policy-agent/opa/topdown.(*eval).biunify(0xc0001eee00, 0xc00033d988?, 0x10000ff27?, 0x28?, 0x1017e7a00?, 0x101855201?)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:854 +0x17e
github.com/open-policy-agent/opa/topdown.(*eval).unify(0x10?, 0x10187b120?, 0xd07693660033d901?, 0xc00033da68?)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:843 +0x26
github.com/open-policy-agent/opa/topdown.(*eval).evalStep(0xc0001eee00, 0xc000713650)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:361 +0x5f9
github.com/open-policy-agent/opa/topdown.(*eval).evalExpr(0xc0001eee00, 0xc00005d300)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:342 +0xec
github.com/open-policy-agent/opa/topdown.(*eval).next(...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:168
github.com/open-policy-agent/opa/topdown.(*eval).evalExpr.func1(0xc0001eee00)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:343 +0x29
github.com/open-policy-agent/opa/topdown.(*eval).evalStep.func3()
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:385 +0x1e5
github.com/open-policy-agent/opa/topdown.(*eval).biunifyValues(0xc0001eee00, 0xc000185860, 0xc000192450, 0xc000192420, 0xc000192420, 0xc000192480)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:1005 +0x502
github.com/open-policy-agent/opa/topdown.(*eval).biunify(0xc0001eee00, 0xc00033ddb8?, 0x10000ff27?, 0x30?, 0x1017fcfc0?, 0xc00040ea01?)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:863 +0x23d
github.com/open-policy-agent/opa/topdown.(*eval).unify(0xc000454d80?, 0xa?, 0xc00033dea0?, 0x2?)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:843 +0x26
github.com/open-policy-agent/opa/topdown.(*eval).evalStep(0xc0001eee00, 0xc000713610)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:377 +0x4c9
github.com/open-policy-agent/opa/topdown.(*eval).evalExpr(0xc0001eee00, 0xc00005d300)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:342 +0xec
github.com/open-policy-agent/opa/topdown.(*eval).eval(...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:305
github.com/open-policy-agent/opa/topdown.evalVirtualComplete.partialEval({0xc0001eec00, {0xc00071ac00, 0x3, 0x4}, {0xc000131e90, 0x3, 0x3}, 0x2, 0xc000405d80, 0xc00018ff20, ...}, ...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:2852 +0x32b
github.com/open-policy-agent/opa/topdown.evalVirtualComplete.eval({0xc0001eec00, {0xc00071ac00, 0x3, 0x4}, {0xc000131e90, 0x3, 0x3}, 0x2, 0xc000405d80, 0xc00018ff20, ...}, ...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:2759 +0x1fd
github.com/open-policy-agent/opa/topdown.evalVirtual.eval({0xc0001eec00, {0xc00071ac00, 0x3, 0x4}, {0xc000131e90, 0x3, 0x3}, 0x2, 0xc00018ff20, 0xc000192180, ...}, ...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:2299 +0x3e5
github.com/open-policy-agent/opa/topdown.evalTree.next({0xc0001eec00, {0xc00071ac00, 0x3, 0x4}, {0xc000131e90, 0x3, 0x3}, 0x2, 0xc00018ff20, 0xc000192180, ...}, ...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:2102 +0x2be
github.com/open-policy-agent/opa/topdown.evalTree.eval({0xc0001eec00, {0xc00071ac00, 0x3, 0x4}, {0xc000131e90, 0x3, 0x3}, 0x2, 0xc00018ff20, 0xc000192180, ...}, ...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:2055 +0xc5
github.com/open-policy-agent/opa/topdown.evalTree.next({0xc0001eec00, {0xc00071ac00, 0x3, 0x4}, {0xc000131e90, 0x3, 0x3}, 0x1, 0xc00018ff20, 0xc000192180, ...}, ...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:2108 +0x305
github.com/open-policy-agent/opa/topdown.evalTree.eval({0xc0001eec00, {0xc00071ac00, 0x3, 0x4}, {0xc000131e90, 0x3, 0x3}, 0x1, 0xc00018ff20, 0xc000192180, ...}, ...)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:2055 +0xc5
github.com/open-policy-agent/opa/topdown.(*eval).biunifyRef(0xc0001eec00, 0x101ca3820?, 0xc000192180, 0xc00018ff20, 0xc00018ff20, 0x100017f90?)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:1042 +0x405
github.com/open-policy-agent/opa/topdown.(*eval).biunifyValues(0xc0001eec00, 0xc00018f770, 0xc000192180, 0xc00018ff20, 0xc00018ff20, 0xc0001921b0)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:958 +0x112
github.com/open-policy-agent/opa/topdown.(*eval).biunify(0xc0001eec00, 0xc00033e950?, 0x10000ff27?, 0x30?, 0x1017fcfc0?, 0xc00040ea01?)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:854 +0x17e
github.com/open-policy-agent/opa/topdown.(*eval).unify(0xc000454d20?, 0xa?, 0xc00033ea38?, 0x2?)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:843 +0x26
github.com/open-policy-agent/opa/topdown.(*eval).evalStep(0xc0001eec00, 0xc000713570)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:377 +0x4c9
github.com/open-policy-agent/opa/topdown.(*eval).evalExpr(0xc0001eec00, 0xc000713560)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:342 +0xec
github.com/open-policy-agent/opa/topdown.(*eval).eval(0xc000126e20?, 0x10187c686?)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:305 +0x19
github.com/open-policy-agent/opa/topdown.(*eval).Run(0xc0001eec00, 0xc00071aee0)
        /Users/stephan/Sources/open-policy-agent/opa/topdown/eval.go:106 +0xaa
github.com/open-policy-agent/opa/topdown.(*Query).PartialRun(0xc000643a00, {0x101ca19b0?, 0xc00011e018})
        /Users/stephan/Sources/open-policy-agent/opa/topdown/query.go:389 +0x128d
github.com/open-policy-agent/opa/rego.(*Rego).partial(0xc000043880, {0x101ca19b0?, 0xc00011e018}, 0xc0001f4000)
        /Users/stephan/Sources/open-policy-agent/opa/rego/rego.go:2356 +0x985
github.com/open-policy-agent/opa/rego.PreparedPartialQuery.Partial({{0xc000043880?, 0xc000523910?}}, {0x101ca19b0, 0xc00011e018}, {0xc0005236b0?, 0x2e?, 0xa?})
        /Users/stephan/Sources/open-policy-agent/opa/rego/rego.go:485 +0x15b
github.com/open-policy-agent/opa/cmd.evalOnce({0x101ca19b0, 0xc00011e018}, 0xc0001eea00)
        /Users/stephan/Sources/open-policy-agent/opa/cmd/eval.go:444 +0xf27
github.com/open-policy-agent/opa/cmd.eval({_, _, _}, {0xc0001dedf8, 0x0, 0x1, {0xc000522bb0, 0x1, 0x1}, {0x1026c5b90, ...}, ...}, ...)
        /Users/stephan/Sources/open-policy-agent/opa/cmd/eval.go:353 +0x3eb
github.com/open-policy-agent/opa/cmd.init.5.func2(0xc000005200?, {0xc0000c2190?, 0x5?, 0x5?})
        /Users/stephan/Sources/open-policy-agent/opa/cmd/eval.go:273 +0x78
github.com/spf13/cobra.(*Command).execute(0xc000005200, {0xc0000c2140, 0x5, 0x5})
        /Users/stephan/Sources/open-policy-agent/opa/vendor/github.com/spf13/cobra/command.go:944 +0x847
github.com/spf13/cobra.(*Command).ExecuteC(0x10266f9c0)
        /Users/stephan/Sources/open-policy-agent/opa/vendor/github.com/spf13/cobra/command.go:1068 +0x3bd
github.com/spf13/cobra.(*Command).Execute(0xc0000061a0?)
        /Users/stephan/Sources/open-policy-agent/opa/vendor/github.com/spf13/cobra/command.go:992 +0x19
main.main()
        /Users/stephan/Sources/open-policy-agent/opa/main.go:14 +0x25

Note that shallow inlining / no shallow inlining corresponds to -O1 and -O2 when building optimized bundles.
@srenatus srenatus added the bug label Jun 19, 2023
srenatus added a commit to srenatus/opa that referenced this issue Jun 19, 2023
@srenatus
topdown: fix panic in partial eval with ref head rule
8e7a9fa 
Fixes open-policy-agent#6027.

Signed-off-by: Stephan Renatus <stephan@styra.com>
@srenatus srenatus mentioned this issue Jun 19, 2023
Merged
ashutosh-narkar pushed a commit that referenced this issue Jun 19, 2023
@srenatus @ashutosh-narkar
topdown: fix panic in partial eval with ref head rule
ca1a7cf 
Fixes #6027.

Signed-off-by: Stephan Renatus <stephan@styra.com>
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topdown: fix panic in partial eval with ref head rule srenatus/opa
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@srenatus