pongoOS sometimes hangs at "Booting" after module load and bootx

[jsherman212]

While writing a pongoOS module, I noticed the device would sometimes hang at "Booting" after bootx was issued after a module was loaded:

At first I thought it was something my module was doing, but this issue is present on a module that just registers its own preboot hook that invokes checkra1n's preboot hook to run its KPF.

This happens around 10% of the time on an iPhone X running iOS 13.3.1, an iPhone 8 running iOS 13.6, and an iPhone SE (original, 2016) running iOS 13.6. The only device I could not get this issue to happen on is an iPhone 7 running iOS 13.1.2.

I attached the barebones module which causes the problem. I use libusb 1.0.23 to communicate with the device, and I compile this on macOS 10.15.4. To compile, unzip to some directory, cd to that directory, and make. Then: loader/loader module/module and boot the device to a pongo shell. checkra1n version is beta 0.10.2.

pongo_hanger.zip

[woachk]

Hello,

could you add -v to the boot arguments and take a picture please to see where it hangs in XNU?

Thank you,

[jsherman212]

XNU never actually boots, it just hangs at "Booting", so even with -v nothing is shown

[funcoleto]

XNU never actually boots, it just hangs at "Booting", so even with -v nothing is shown

please, could you send me the pongo.bin version 1.2.1?

[equalisysdev]

Got the same issue with Iphone 8 and iOS 16.7.4. I first launched palera1n from an intel mac with the cf flags then only the f flag before my phone entered pongoOS I couldn't get out of that state, and after a tenth of minutes, my phone just restarted normally I retried but only got the same issue I think it's a problem with Palerain's cf flags

I didn't have any issue after that