On Sat, Sep 07, 2024 at 07:02:30PM +0800, Ming Lei wrote:
> BTW, the issue can be reproduced 100% by:
>
> echo "deadlock" > /sys/block/$ROOT_DISK/queue/scheduler
That doesn't reproduce it for me (reliably). Although I'm not
surprised as this bug has been _very_ tricky to reproduce! Sometimes
I think I have a definite reproducer, only for it to go away when some
tiny detail changes.
> > This seems like the neatest (or shortest) fix so far, but doesn't it
> > "mix up layers" by checking elv_iosched_store?
>
> It is just one exception for 'scheduler' sysfs attribute wrt. freezing
> queue for storing, and the check can be done via the attribute
> name("scheduler") too.
Fair enough.
Rich.
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