mntroot ro fails on kindle signature running 5.17.0

hanginwithdaddo · 04-18-2025, 06:40 PM

I've noticed that "mntroot ro" (mount -o remount,ro /) fails on my kindle signature 12th generation device, which has been jailbroken using Winterbreak and has MR Installer, KUAL, and kterm installed. With just these things, I tried invoking "mount -o remount,ro /" and it fails with a "device busy" message. I believe that Amazon's code is causing something to leave / open for write, possibly before another mount is done on top of a directory within the default root partition, and I'm curious to find the root cause. I was tempted to add a shell script call to some of the /etc/upstart/*.conf files to try to track down the root cause.
Has anyone else noticed this? I did see an old, related thread, but it appeared that this was with a much older device. Thanks in advance for sharing any similar results or advice that you might have.

hanginwithdaddo · 05-19-2025, 06:55 AM

This has been fixed by a subsequent 5.17 release.

04-18-2025, 06:40 PM	#1
hanginwithdaddo Enthusiast Posts: 32 Karma: 122 Join Date: Apr 2025 Location: Pennsylvania, USA Device: Kindle Signature, 12th Gen.	mntroot ro fails on kindle signature running 5.17.0 I've noticed that "mntroot ro" (mount -o remount,ro /) fails on my kindle signature 12th generation device, which has been jailbroken using Winterbreak and has MR Installer, KUAL, and kterm installed. With just these things, I tried invoking "mount -o remount,ro /" and it fails with a "device busy" message. I believe that Amazon's code is causing something to leave / open for write, possibly before another mount is done on top of a directory within the default root partition, and I'm curious to find the root cause. I was tempted to add a shell script call to some of the /etc/upstart/.conf files to try to track down the root cause. Has anyone else noticed this? I did see an old, related thread, but it appeared that this was with a much older device. Thanks in advance for sharing any similar results or advice that you might have. Last edited by hanginwithdaddo; 04-18-2025 at 06:42 PM.*

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05-19-2025, 06:55 AM	#2
hanginwithdaddo Enthusiast Posts: 32 Karma: 122 Join Date: Apr 2025 Location: Pennsylvania, USA Device: Kindle Signature, 12th Gen.	This has been fixed by a subsequent 5.17 release.