Re: System freeze with BTRFS corruption on 4 systems with kernel 5.12 (MANJARO)

On 2021/5/19 下午1:39, Swâmi Petaramesh wrote:

Hi list,

(Please CC: me on replies, I'm not currently susbscribed to the list)

This is to report a bug with Manjaro Linux 5.12.1-2 kernel that
immediately affected 4 different, usually stable machines after update
to kernel 5.12 from 5.11 or 5.10, and went away after reverting back to
either 5.10 or 5.11.

Kernel affected : Linux 5.12.1-2-MANJARO
(Not sure if I tried Manjaro Linux 5.12.1-1-MANJARO)

Kernel not affected : All previous versions up to 5.11.18-1-MANJARO

Symptoms : Under heavy disk usage (such as performing a system backup
onto external USB HD) the machine soon completely freezes and only a
hard power cycle can get it out of it.

Any dying message?

After reboot, systems on which BTRFS is built over bcache may show heavy
filesystem corruption.

Which kind of corruption? Just data csum mismatch?

Does `btrfs check` reports other problems?

Thanks,
Qu

Happened on :

- HP Laptop 1 (Intel Atom) : BTRFS over LUKS on SSD : System freeze, no
BTRFS corruption after reboot.

- Dell Laptop 1 (Intel Core2 duo) : BTRFS over LUKS on SSD : System
freeze, no BTRFS corruption after reboot.

- HP Laptop 2 : One BTRFS FS over LUKS on SSD, and one BTRFS over bcache
over LUKS on HD+SSD : System freeze, SSD BTRFS was not corrupt but BTRFS
over bcache was severely corrupt, beyond repair and had to be rebuilt
and restored from backups.

- Asus old desktop with AMD Athlon 64 X2 : BTRFS RAID-1 over bcache over
LUKS on 2 HD + SSD : System freeze, heavy BTRFS corruption that could
however be fixed by simply running a “btrfs scrub” after reverting back
to a 5.10 Manjaro kernel.


To be thorough, I also have to report an Arch Linux Intel Celeron
machine running 5.12.4-arch1-2 kernel, BTRFS over LUKS on SSD, that has
been running for a while without showing any such symptom.


Hope these reports can be useful.

Best regards.

ॐ