Re: random i/o error without error in dmesg

Duncan
2015-10-28T12:46:41Z

Szalma László posted on Wed, 28 Oct 2015 09:44:12 +0100 as excerpted:

> The umount/mount ALWAYS solved the problem for me, mount -o remount,ro
> was tried for the first time, but it was not enought. Reboot was not
> needed.
> (kernel 4.2.4)

So that means it's filesystem state that's tracked thru a remount, not
something like deleted/orphan files that a remount should square away.
But a full unmount clears the state, without having to unload the btrfs
kernel module or reboot.

Which at least limits the active zone of the problem. Unfortunately, I'm
not a dev and don't have a clue where to go from there... unless it's
related to the recent delayed-refs bug, in which case I believe a late
4.3 rc, or 4.3.0 when released, should fix it. That fix should be CCed
to stable and thus appear there eventually, but I normally track pre-
releases, not stable, so don't know how long it might be... And again, I
don't know it's even related, but it does appear to be the active bug of
the moment, so in the absence of knowing, one can hope.

--
Duncan - List replies preferred. No HTML msgs.
"Every nonfree program has a lord, a master --
and if you use the program, he is your master." Richard Stallman