[OpenAFS] getcwd() error for RHEL 7.4 kernel

Matt Vander Werf mvanderw@nd.edu
Fri, 27 Oct 2017 12:34:08 -0400


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Hi Ben,

Following
https://unix.stackexchange.com/questions/17936/setting-proc-sys-vm-drop-caches-to-clear-cache,
I dropped the pagecache (echo 1 > /proc/sys/vm/drop_caches) and that didn't
make any difference. I then freed the dentries and inodes (echo 2 >
/proc/sys/vm/drop_caches) and that didn't make any difference either.

Let me know if there's anything else we could try.

Thanks.

--
Matt Vander Werf
HPC System Administrator
University of Notre Dame
Center for Research Computing - Union Station
506 W. South Street
South Bend, IN 46601
Phone: (574) 631-0692

On Fri, Oct 27, 2017 at 12:24 PM, Benjamin Kaduk <kaduk@mit.edu> wrote:

> On Fri, Oct 27, 2017 at 12:13:32PM -0400, Matt Vander Werf wrote:
> >
> > Any ideas what might be the issue? Anything else we can try that might
> help
> > diagnose this?
>
> I forget if this was covered in the initial report, but did you try writing
> to /proc/sys/vm/drop_caches (IIRC the usable values are a bitmask with
> multiple possible bits to try)?
>
> That would be expected to help if it is the OSes VFS cache that's getting
> corrupted, as opposed to the AFS-specific cache.
>
> -Ben
>

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<div dir=3D"ltr">Hi Ben,<br><br>Following <a href=3D"https://unix.stackexch=
ange.com/questions/17936/setting-proc-sys-vm-drop-caches-to-clear-cache">ht=
tps://unix.stackexchange.com/questions/17936/setting-proc-sys-vm-drop-cache=
s-to-clear-cache</a>, I dropped the pagecache (echo 1 &gt; /proc/sys/vm/dro=
p_caches) and that didn&#39;t make any difference. I then freed the dentrie=
s and inodes (echo 2 &gt; /proc/sys/vm/drop_caches) and that didn&#39;t mak=
e any difference either.<br><div class=3D"gmail_extra"><br></div><div class=
=3D"gmail_extra">Let me know if there&#39;s anything else we could try.</di=
v><div class=3D"gmail_extra"><br></div><div class=3D"gmail_extra">Thanks.</=
div><div class=3D"gmail_extra"><br clear=3D"all"></div><div class=3D"gmail_=
extra"><div><div class=3D"gmail_signature" data-smartmail=3D"gmail_signatur=
e"><div dir=3D"ltr"><div>--<br></div><div>Matt Vander Werf<br>HPC System Ad=
ministrator<br>University of Notre Dame<br>Center for Research Computing - =
Union Station<br>506 W. South Street<br>South Bend, IN 46601<br></div>Phone=
: (574) 631-0692</div></div></div>
<br><div class=3D"gmail_quote">On Fri, Oct 27, 2017 at 12:24 PM, Benjamin K=
aduk <span dir=3D"ltr">&lt;<a href=3D"mailto:kaduk@mit.edu" target=3D"_blan=
k">kaduk@mit.edu</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote"=
 style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><s=
pan class=3D"">On Fri, Oct 27, 2017 at 12:13:32PM -0400, Matt Vander Werf w=
rote:<br>
&gt;<br>
&gt; Any ideas what might be the issue? Anything else we can try that might=
 help<br>
&gt; diagnose this?<br>
<br>
</span>I forget if this was covered in the initial report, but did you try =
writing<br>
to /proc/sys/vm/drop_caches (IIRC the usable values are a bitmask with<br>
multiple possible bits to try)?<br>
<br>
That would be expected to help if it is the OSes VFS cache that&#39;s getti=
ng<br>
corrupted, as opposed to the AFS-specific cache.<br>
<br>
-Ben<br>
</blockquote></div><br></div></div>

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