[Bug 219166] ext4 hang when setting echo noop > /sys/block/sda/queue/scheduler

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=219166

Theodore Tso (tytso@mit.edu) changed:

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                 CC|                            |tytso@mit.edu

--- Comment #1 from Theodore Tso (tytso@mit.edu) ---
This is a bug in the block layer, not in ext4.  It's also a fairly
long-standing issue; I remember seeing something like in our Data Center
kernels at $WORK at least five plus years ago.   At the time, we dealt with
this via the simple expedient of "Doctor, Doctor, it hurts when I do that. 
Well, then don't do that then!"

At the time it happened relatively rarely; if you're able to reliably reproduce
it, perhaps it would be useful to send a script with said reliable reproducer
to the linux-block list, and perhaps try to do a bisect to see when it became
trivially easy to trigger.

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