make_dev_ssd.sh --remove_rootfs_verification is not working in recent VM images?

[david...@chromium.org]

I often test Chrome OS in a VM, and I often make the root fs writable so I can tweak flags in /sbin/session_manager_setup.sh

To make the root file system writable, I run:

sudo /usr/share/vboot/bin/make_dev_ssd.sh --remove_rootfs_verification --force

This worked in late Dec, but when I tried it today, it hangs.  After it's hung, I can't ctrl-c, and a reboot also hangs the VM.

I tried VMs from these builds:

 Dec 20 20:44 ChromeOS-R34-5123.0.0-lumpy/

 Jan  2 16:47 ChromeOS-R34-5184.0.0-lumpy/

 Feb  3 16:18 ChromeOS-R34-5410.0.0-lumpy/

 Feb 20 13:15 ChromeOS-R34-5500.1.0-lumpy/

... and only the ChromeOS-R34-5123.0.0-lumpy build from Dec 20 works.

Has anyone else run make_dev_ssd.sh successfully in VM from a recent build?  (Note that running on a chromebook seems to work, so this seems to be VM-related?)

Thanks!

David

[Sonny Rao]

I just tried it and it looks like it worked. This was on a falco
build that I made myself.
ChromeOS running in a VM uses the legacy bootloader, syslinux. So you
could check to see if it's working by looking at the syslinux config
file by mounting /dev/sda12 and looking in the syslinux directory

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[David Roche]

Interesting.  I just tried a falco image, and it worked.  The same version of a lumpy image had the hanging issue that I mentioned.

David

[Sonny Rao]

there's a generic hang on reboot bug that i'm working on -
crbug.com/212879 and I have seen the VM hang even outside of a reboot
at least once, so there might just be some generic instability there.