[Bug 219362] USB SATA does not correctly shutdown the SSD upon poweroff causing data loss

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=219362

Michał Pecio (michal.pecio@gmail.com) changed:

           What    |Removed                     |Added
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                 CC|                            |michal.pecio@gmail.com

--- Comment #17 from Michał Pecio (michal.pecio@gmail.com) ---
These operations are asynchronous and they don't even seem to be synchronized
against each other. This is what I got from s followed u:

[ 9oct 19:21] sysrq: Emergency Sync
[  +0,000028] sysrq: Emergency Remount R/O
[  +0,019142] EXT4-fs (sda2): re-mounted ef717e3d-539d-4988-9a02-ca541d643379
ro. Quota mode: disabled.
[  +0,002201] Emergency Sync complete
--- some long error message here
              Emergency Remount complete

If subsequent o would execute before the u is done, the u would only increase
risk of data loss by making the disk busy right before powerdown and by
exercising the remount code against a concurrent loss of power, which might be
a neglected case due to its rarity.

You will never know whom to blame without hours of debugging. Myself, I would
try
sync ; poweroff -f

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