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https://bugs.launchpad.net/bugs/1776005
Title:
kernel instability with BTRFS filesystem as rootfs
Status in linux package in Ubuntu:
Incomplete
Bug description:
Hello,
As explained yesterday on #ubuntu-kernel, several laptop won't boot
(kernel panic) with the latest kernel 4.4.0-127-generic (x86_64) and
upper (proposed 4.4.0-128-generic), on Xenial 16.04 LTS
I have made many tests to verify that the bootloader (GRUB) is
correctly configured (I have also reinstall it, but same result).
I have also verified the BTRFS system is clean and not corrupted (with
a livecd).
The behavior is unpredictable, because often the kernel fall in
"panic" during boot, but not all the time, if i do several consecutive
reboot to test stability of the boot "process". I have no search
behavior with previous kernels (like 4.4.0-124-generic).
I suspect (even if I'm quiet disturbed by this behavior, maybe I wrong) that
something I changed on last kernel:
- on BTRFS subsystem, I have "aggregate" BTRFS partitions as rootfs (for a
long time)
- something related with the last mitigation about the recent security
processor breach
But my skills stop here, and I'm not able to find the origin of this behavior
despite my efforts.
I can continue my investigation if I have some additional pointers.
Thanks for your time,
Sylvain
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