‘This release has a nonzero chance to break existing scripts that
use some extension features – I had to quote some tildes in
dot.mkshrc and a variable expansion in ${x/y"$z"} in MirWebseite
(the $z) – twice!. As usual, test!’
-- https://www.mirbsd.org/permalinks/news_e20151212-tg.htm
This fixes #10828 by removing the msize option and also disabling the
writeback cache for the root file system of the test machines.
I've tested this across 5 evaluations on my Hydra, where I run tests for
specific machine configurations:
https://headcounter.org/hydra/eval/304437?filter=testshttps://headcounter.org/hydra/eval/304438?filter=testshttps://headcounter.org/hydra/eval/304439?filter=testshttps://headcounter.org/hydra/eval/304440?filter=testshttps://headcounter.org/hydra/eval/304441?filter=tests
So to summarize on the test failures:
Eval Test failures
304437 quake3, virtualbox
304438
304439 virtualbox
304440 virtualbox
304441
Both the quake3 and virtualbox test failures are unrelated to this merge
and I didn't have to cancel or restart any other jobs. The only jobs I
really had to cancel were the virtualbox jobs, so we no longer should
have "hanging" jobs in the queue due to page allocation failures of the
9p shares.
This is in controst to every evaluation before 304437, where I needed to
constantly restart VM tests.
Thanks a lot to @wizeman for finding the original issue and to
@domenkozar and @lethalman for testing and additional findings (such as
the issue with the cache option).
This seems to be the root cause of the random page allocation failures
and @wizeman did a very good job on not only finding the root problem
but also giving a detailed explanation of it in #10828.
Here is an excerpt:
The problem here is that the kernel is trying to allocate a contiguous
section of 2^7=128 pages, which is 512 KB. This is way too much:
kernel pages tend to get fragmented over time and kernel developers
often go to great lengths to try allocating at most only 1 contiguous
page at a time whenever they can.
From the error message, it looks like the culprit is unionfs, but this
is misleading: unionfs is the name of the userspace process that was
running when the system ran out of memory, but it wasn't unionfs who
was allocating the memory: it was the kernel; specifically it was the
v9fs_dir_readdir_dotl() function, which is the code for handling the
readdir() function in the 9p filesystem (the filesystem that is used
to share a directory structure between a qemu host and its VM).
If you look at the code, here's what it's doing at the moment it tries
to allocate memory:
buflen = fid->clnt->msize - P9_IOHDRSZ;
rdir = v9fs_alloc_rdir_buf(file, buflen);
If you look into v9fs_alloc_rdir_buf(), you will see that it will try
to allocate a contiguous buffer of memory (using kzalloc(), which is a
wrapper around kmalloc()) of size buflen + 8 bytes or so.
So in reality, this code actually allocates a buffer of size
proportional to fid->clnt->msize. What is this msize? If you follow
the definition of the structures, you will see that it's the
negotiated buffer transfer size between 9p client and 9p server. On
the client side, it can be controlled with the msize mount option.
What this all means is that, the reason for running out of memory is
that the code (which we can't easily change) tries to allocate a
contiguous buffer of size more or less equal to "negotiated 9p
protocol buffer size", which seems to be way too big (in our NixOS
tests, at least).
After that initial finding, @lethalman tested the gnome3 gdm test
without setting the msize parameter at all and it seems to have resolved
the problem.
The reason why I'm committing this without testing against all of the
NixOS VM test is basically that I think we can only go better but not
worse than the current state.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
