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MacOS: Big Sur - The Writer Process Ended Unexptec

See original GitHub issue

Hi,

After updating to version 1.5.111, I have found that I am unable to flash anything onto a MicroSD card. I have formatted the card to FAT format. Below is some information about errors that occur everytime I try to flash a card. A few minutes prior to updating to version 1.5.111, I was using version 1.5.110 on the same operating system and I was able to successfully flash a .img.xz file onto a microSD card. I suspect a minor change in the latest version (1.5.11) may be causing this issue.

Etcher version: 1.5.111
Operating system and architecture: MacOS Big Sur 11.0.1
Image flashed: .img.xz and .iso
Do you see any meaningful error information in the DevTools? When attempting to flash a .img.xz file, the following occurred:

{"stack":"Error: Can't configure or trim a source that is not randomly readable, skipping\nError: EBADF: bad file descriptor, read\n/Applications/balenaEtcher.app/Contents/Resources/app/generated/child-writer.js:4074\n                throw ex;\n                ^\n\nRuntimeError: abort(Error: EBADF: bad file descriptor, read). Build with -s ASSERTIONS=1 for more info.\n    at process.abort (/Applications/balenaEtcher.app/Contents/Resources/app/generated/child-writer.js:4453:17)\n    at process.emit (events.js:228:7)\n    at processPromiseRejections (internal/process/promises.js:201:33)\n    at processTicksAndRejections (internal/process/task_queues.js:95:32)\n\n    at createError (file:///Applications/balenaEtcher.app/Contents/Resources/app/generated/gui.js:71076:23)\n    at elevateScriptCatalina (file:///Applications/balenaEtcher.app/Contents/Resources/app/generated/gui.js:87259:19)\n    at async withTmpFile (file:///Applications/balenaEtcher.app/Contents/Resources/app/generated/gui.js:85838:20)\n    at async elevateCommand (file:///Applications/balenaEtcher.app/Contents/Resources/app/generated/gui.js:87275:16)\n    at async Server.<anonymous> (file:///Applications/balenaEtcher.app/Contents/Resources/app/generated/gui.js:87428:37)","message":"Can't configure or trim a source that is not randomly readable, skipping\nError: EBADF: bad file descriptor, read\n/Applications/balenaEtcher.app/Contents/Resources/app/generated/child-writer.js:4074\n                throw ex;\n                ^\n\nRuntimeError: abort(Error: EBADF: bad file descriptor, read). Build with -s ASSERTIONS=1 for more info.\n    at process.abort (/Applications/balenaEtcher.app/Contents/Resources/app/generated/child-writer.js:4453:17)\n    at process.emit (events.js:228:7)\n    at processPromiseRejections (internal/process/promises.js:201:33)\n    at processTicksAndRejections (internal/process/task_queues.js:95:32)\n","image":"ubuntu-20.04.1-5.4-mate-odroid-xu4-20200818.img.xz"}

When attempting to flash a .iso file, the following occured:

{"stack":"Error: The writer process ended unexpectedly\n    at createError (file:///Applications/balenaEtcher.app/Contents/Resources/app/generated/gui.js:71076:23)\n    at createUserError (file:///Applications/balenaEtcher.app/Contents/Resources/app/generated/gui.js:71087:16)\n    at Server.<anonymous> (file:///Applications/balenaEtcher.app/Contents/Resources/app/generated/gui.js:87446:28)","message":"The writer process ended unexpectedly","description":"Please try again, and contact the Etcher team if the problem persists","report":false,"image":"ubuntu-20.04.1-live-server-amd64.iso"}