Xcode 12.2 Beta 3 on macOS 11 Beta 11: SIGCONT when debugging projects

Question

Created Oct ’20

Replies 18

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Participants 17

I don't know if this is a Xcode bug but all my projects just stop debugging with a SIGCONT message. I can still resume them but this is annoying.

I can even reproduce the issue by creating a new Mac app with the basic project template and it'll SIGCONT as soon as I start debugging.

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Answer 1

midnight beep OP

Oct ’20

I'm getting this all over the place with building and running my apps on Xcode 12.2 Beta 3 on macOS 11 Beta 10. Hope there's a work around or fix. Also continuing doesn't always work for me.

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Answer 2

gazsiazasz OP

Oct ’20

Same here, Xcode can not load my apps.

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Answer 3

midnight beep OP

Oct ’20

I have ended up adding a scheme to my project to build and run without(!) debugging as a halfway work around. Most of my apps will continue (Control-Command-Y has never been so helpful), but one of my apps fails to run if its launch is interrupted this way—so no debug for that one.

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Answer 4

SarahR OP

Oct ’20

Thank you. The tip to create a scheme with "Debug executable" turned off in the Run settings is working for me.

No ideal but at least I can run my apps now.

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Answer 5

ufo22940268 OP

Oct ’20

Check "Debug process as root" can fix it.

1

Answer 6

Ryder OP

Oct ’20

This has been bugging me all afternoon. I had also just installed macOS 11b10 (20A5395g).

In a post from 9 months ago, Quinn shows that lldb will stop at SIGCONT by default and suggests a temporary workaround:

Code Block (lldb) process handle -n false -s false SIGCONT

I tried and failed to get this to work in my .lldbinit, then found this old SO post:

At present the suggestion of doing this in a breakpoint command on main is the most elegant solution available.

I added a symbolic breakpoint for main that runs the above debugger command and continues. It fixes the annoying issue of the debugger pausing immediately, although lldb-rpc-server will still use an entire CPU core while doing nothing…

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Answer 7

aussiebloke OP

Oct ’20

The best I've got, if you want to launch and still debug:

In the Run settings, change Launch from Automatically to Wait for executable to be launched
⌘+R to Run (which will also build)
Once "Waiting to attach to <Target>" shows, manually launch your built binary from Finder and the debugger will automatically attach

This consistently works for me

2

Answer 8

publicspace OP

Oct ’20

Experiencing the same problem. Fixed by choosing "Debug Process as Root" in Schema "Run" -> "Info".

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Answer 9

peggers123 OP

Oct ’20

Yup same experience - even with a brand new Xcode SwiftUI template project.

Confirm that the "Debug process as root" fixes it for now...

1

Answer 10

C_Wiz OP

Oct ’20

Just to add some feedback, I've also hit that issue with macOS 11 Beta 10 and Xcode 12.2 beta 2 (I hadn't updated to beta3 yet). So It may not be just an Xcode 12.2 beta 3 thing.

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Answer 11

aussiebloke OP

Oct ’20

I have a workaround:

Add a symbolic breakpoint

Symbol: _main
Module: dyld
Action: Debugger Command with the command process handle -n false -s false SIGCONT
Options: Check Automatically continue after evaluating actions

15

Answer 12

raymo OP

Oct ’20

Just to add a little information here as well. I can't debug with Xcode 12.1 GM Seed. If I attempt to, it immediately stops at dyld'__fcntl. This is only happening after updated to BigSur beta 10 and happens on both my iMac and MacBook Pro. I also tried a template project and get the same thing. It appears there's something pretty wrong with BigSur beta 10.

However, Xcode 12.2 beta 3 does seem to work for me.

Fortunately, the "Debug process as root" setting resolves debugging with 12.1.

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Answer 13

TapZapp OP

Oct ’20

This is also happening to me. It happened to me after I upgraded to macOS 11 Beta 10, but before Xcode 12.2 Beta 3. I was still on Beta 2 when I first saw the crash. So then I upgraded to Xcode 12.2 Beta 3 and it still crashes.

I knew it had to be something with the debugger because I could launch the built application from the Finder, but not from within Xcode.

Thanks for the workarounds. At least I can run now.

1

Answer 14

rnikander OP

Oct ’20

At first I was able to simply hit the continue button in the debugger, to run my app. Now it's stopping in a different place, and when I hit continue the app never shows up. The stack frame it stops in is now dyld`ImageLoader::trieWalk.

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Answer 15

Arnfried Griesert OP

Oct ’20

Same problem. After I installed macOS 11.0 beta (20A5395g) and Xcode 12.2 beta 3 (12B5035g) all my mac projects are crashing with the same error message. The symbolic breakpoint mentioned above by aussiebloke solves the problem.

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