nil pointer: page.getFrameElement

[inancgumus]

Brief summary

Test Run ID: 2015119

There is a nil pointer exception in:

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0x11af156]

goroutine 2213 [running]:
github.com/grafana/xk6-browser/common.(*Page).getFrameElement(0xc00225d1e0, 0xc002d50540)
github.com/grafana/xk6-browser@v1.1.0/common/page.go:274 +0x2d6
github.com/grafana/xk6-browser/common.(*Frame).FrameElement(0xc002d50540)
github.com/grafana/xk6-browser@v1.1.0/common/frame.go:834 +0x106
github.com/grafana/xk6-browser/common.(*ElementHandle).checkHitTargetAt(0xc0002d1a90, {0x19d8f28?, 0xc002a7ab60?}, {0x407eff2000000000, 0x407da00000000000})
github.com/grafana/xk6-browser@v1.1.0/common/element_handle.go:70 +0x6a
github.com/grafana/xk6-browser/common.(*ElementHandle).newPointerAction.func1({0x19d8f28, 0xc002a7ab60}, 0x0?)
github.com/grafana/xk6-browser@v1.1.0/common/element_handle.go:1449 +0x52b
github.com/grafana/xk6-browser/common.retryPointerAction({0x19d8f28, 0xc002a7ab60}, 0xc000ea60a0, 0xc000b3cf00)
github.com/grafana/xk6-browser@v1.1.0/common/element_handle.go:1488 +0x3c
github.com/grafana/xk6-browser/common.(*ElementHandle).newPointerAction.func2({0x19d8f28?, 0xc002a7ab60?}, 0xc000b3cf00?, 0x44f120?)
github.com/grafana/xk6-browser@v1.1.0/common/element_handle.go:1476 +0x35
github.com/grafana/xk6-browser/common.(*Frame).click.(*Frame).newPointerAction.func2({0x19d8f28, 0xc002a7ab60}, 0xc0009d3e00, 0xc0009d3e60)
github.com/grafana/xk6-browser@v1.1.0/common/frame.go:1991 +0x116
created by github.com/grafana/xk6-browser/common.call in goroutine 2212
github.com/grafana/xk6-browser@v1.1.0/common/helpers.go:102 +0x15c

xk6-browser version

1.1.0

OS

remote

Chrome version

remote

Docker version and image (if applicable)

No response

Steps to reproduce the problem

Run the test script locally.

Expected behaviour

No panics.

Actual behaviour

Panics.

[bandorko]

Maybe related with the grafana/xk6-browser#1087
That issue produces similar panic:

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x10 pc=0x11af1d6]
goroutine 472 [running]:
github.com/grafana/xk6-browser/common.(*Page).getFrameElement(0xc000603d40, 0xc0002341c0)
        github.com/grafana/[email protected]/common/page.go:274 +0x2d6
github.com/grafana/xk6-browser/common.(*Frame).FrameElement(0xc0002341c0)
        github.com/grafana/[email protected]/common/frame.go:834 +0x106
github.com/grafana/xk6-browser/common.(*ElementHandle).checkHitTargetAt(0xc0010c8f50, {0x19d8f48?, 0xc000b05180?}, {0x404daa0000000000, 0x40433d70a3d70a3d})
        github.com/grafana/[email protected]/common/element_handle.go:70 +0x6a
github.com/grafana/xk6-browser/common.(*ElementHandle).Click.(*ElementHandle).newPointerAction.func2({0x19d8f48, 0xc000b05180}, 0x0?)
        github.com/grafana/[email protected]/common/element_handle.go:1449 +0x471
github.com/grafana/xk6-browser/common.retryPointerAction({0x19d8f48, 0xc000b05180}, 0xc000b5d120, 0xc00040ea20)
        github.com/grafana/[email protected]/common/element_handle.go:1488 +0x3c
github.com/grafana/xk6-browser/common.(*ElementHandle).Click.(*ElementHandle).newPointerAction.func3({0x19d8f48?, 0xc000b05180?}, 0x116d027?, 0xc001b56fa0?)
        github.com/grafana/[email protected]/common/element_handle.go:1476 +0x35
created by github.com/grafana/xk6-browser/common.call in goroutine 471
        github.com/grafana/[email protected]/common/helpers.go:102 +0x15c

[ankur22]

test run: 3531167

Similar stack trace:

panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x18 pc=0x15900db]

goroutine 1085505 [running]:
github.com/grafana/xk6-browser/common.NewJSHandle(...)
github.com/grafana/[email protected]/common/js_handle.go:65
github.com/grafana/xk6-browser/common.(*ExecutionContext).adoptBackendNodeID(0xc00dab96b0, 0x0)
github.com/grafana/[email protected]/common/execution_context.go:116 +0x37b
github.com/grafana/xk6-browser/common.(*Frame).adoptBackendNodeID(0xc009e30380, {0x1c1e3ad, 0x4}, 0x0)
github.com/grafana/[email protected]/common/frame.go:2060 +0x242
github.com/grafana/xk6-browser/common.(*Page).getFrameElement(0xc002a6fa00, 0xc00a61c8c0)
github.com/grafana/[email protected]/common/page.go:622 +0x3c5
github.com/grafana/xk6-browser/common.(*Frame).FrameElement(0xc00a61c8c0)
github.com/grafana/[email protected]/common/frame.go:1008 +0xf8
github.com/grafana/xk6-browser/common.(*ElementHandle).checkHitTargetAt(0xc0051759a0, {0x1f9ad78?, 0xc0127ef1f0?}, {0x4082e55000000000, 0x407ac60000000000})
github.com/grafana/[email protected]/common/element_handle.go:72 +0x77
github.com/grafana/xk6-browser/common.(*ElementHandle).newPointerAction.func1({0x1f9ad78, 0xc0127ef1f0}, 0x0?)
github.com/grafana/[email protected]/common/element_handle.go:1627 +0x517
github.com/grafana/xk6-browser/common.retryPointerAction({0x1f9ad78, 0xc0127ef1f0}, 0xc00f3741a0, 0xc0205550e0)
github.com/grafana/[email protected]/common/element_handle.go:1672 +0x3c
github.com/grafana/xk6-browser/common.(*ElementHandle).newPointerAction.func2({0x1f9ad78, 0xc0127ef1f0}, 0xc027172c40, 0xc027172cb0)
github.com/grafana/[email protected]/common/element_handle.go:1654 +0x59
github.com/grafana/xk6-browser/common.(*Frame).click.(*Frame).newPointerAction.func2({0x1f9ad78, 0xc0127ef1f0}, 0xc027172c40, 0xc027172cb0)
github.com/grafana/[email protected]/common/frame.go:2208 +0x116
created by github.com/grafana/xk6-browser/common.call in goroutine 1085504
github.com/grafana/[email protected]/common/helpers.go:103 +0x14c

It looks like a CDP request could return nil or a null subtype which is not what we expect (found this in PW).

1. Reproduce this.
2. Protect against this and know what the workaround is for this scenario.

[ankur22]

After taking a close look at this issue, as well as taking inspiration from Playwright code base (specifically 1 -> 2 -> 3) and this Playwright issue, i think if your seeing this error then you're very likely hitting a race condition during an API call to click on an element, and the:

1. Page has navigated away;
2. Or the element that your clicking on is now missing;
3. Or you're working directly with elementHandle instead of locators.

If you're seeing this error while working with locators then please update to the latest version of k6 (v0.56.0 as of writing this) where we have fixed an issue with locators panicking during navigations (PR).