* IO hang with kernel above 4.4.21, heavy IO, btrfs, xen
@ 2017-03-22 19:42 Cheyenne Wills
0 siblings, 0 replies; only message in thread
From: Cheyenne Wills @ 2017-03-22 19:42 UTC (permalink / raw)
To: linux-kernel
I have a reproducible system hang that appears to be the result of heavy IO.
I originally posted the problem to the linux-block mailing list back
in January, but haven't heard back.
Not sure if I reported to the correct area.
There is a bugzill.kernel.org issue open that contains the details of
the problem https://bugzilla.kernel.org/show_bug.cgi?id=193331
The problem occurs if there is a heavy IO load (the system in question
is a FTP server that locked up during a heavy load). I am able to
reproduce the problem using a btrfs scrub to the file system (the
filesystem spans multiple devices). I have a "test system" where I
can reproduce the problem at will (it takes only a few minutes to
cause the IO to hang up).
With a 4.0.5 kernel, I'm unable to reproduce the hang (and the system
in question runs just fine). A kernel above 4.4.21 (maybe earlier?)
results in the hang described in the above bugzilla ticket.
I would appreciate any suggestions on performing further further
diagnostics, or if there is additional information needed to dig
deeper into the problem.
I'm not subscribed to the lkml, so a cc to cheyenne.wills@gmail.com
would be appreciated.
Thanks in advance.
Cheyenne Wills
cheyenne.wills@gmail.com
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