Magisk v27.1+ Installation Failure on x86_64 Emulators: Investigating Issues with Ramdisk Detection and Boot Image Patching

Magisk, a popular Android rooting application, experienced an issue in versions v27.1 and above, particularly impacting x86_64 emulators. Users reported failures during installation, stemming from incorrect Ramdisk detection and subsequent problems patching the boot image. This issue manifested as:

- **Incorrect Ramdisk Detection:** Magisk would incorrectly flag the Ramdisk as 'No', even when it was present.
- **Boot Image Patching Failure:** The patching process for boot.img would fail, preventing a successful installation.
- **magisk_patched.img Writing Error:** Writing the modified boot image (magisk_patched.img) would result in errors.

This issue only appeared in versions 27.1 and beyond. Magisk v27.0 functioned flawlessly on the same emulators and device configurations. The discrepancy suggests a change introduced in the later versions might be incompatible with x86_64 architecture or emulator environments.

**Potential Causes**
The root cause of these issues could be attributed to:

- **Bug in MagiskInstallImpl.kt:** Versions 27.1+ may include a bug in the MagiskInstallImpl.kt file that affects Ramdisk detection or boot image patching logic.
- **Ramdisk Detection Algorithm:** An algorithm change related to identifying the Ramdisk, specifically within x86_64 architecture, could be causing the incorrect detection.
- **Emulator File System Issues:** Non-standard file system implementations on certain emulators might be conflicting with the writing process of magisk_patched.img.

**Further Investigation**
To effectively resolve this issue, a thorough investigation is needed:

- **Code Review:** Analyzing the MagiskInstallImpl.kt code in versions 27.1+ to pinpoint potential bugs or problematic changes.
- **Emulator File System Analysis:** Examining the file system structures of the affected emulators to identify any discrepancies that might hinder proper image writing.
- **Ramdisk Detection Algorithm Validation:** Testing and validating the algorithm responsible for detecting the Ramdisk to ensure its accuracy, especially for x86_64 architectures.

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