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Bug#682007: NULL pointer dereference in __fscache_read_or_alloc_pages



Jonathan Nieder <jrnieder@gmail.com> 2012-09-29 15:22:
Hi again,

In July, 2012, Brian Kroth wrote:
Jonathan Nieder <jrnieder@gmail.com> 2012-07-21 12:04:

Please test the attached patches, for example following the instructions
below:
[...]
Anyways, I'll wait on the results of my previous test first to see if we
have a reliable test case from it before moving forward.

At this point the grep -r abc ... test is just hitting the cache over and
over again, so it's not showing a whole lot.

One other thing I'd tried before was something like this run a couple of
times in a row (hmm, I suppose I could try them in parallel too):

find /fsc_mounted_nfs -type f -exec cat {} > /dev/null \;

A couple of them paniced, but with inconsistent messages, so I had left them
out for now.  Perhaps that's worth another shot ...

So, how did it go?  Did some test case prove reliable?  Any other
new observations?

Sorry, the labs went into their dormant period and all of my test cases ran away for the rest of the summer (the find cmd didn't seem to trigger the __fscache problem), so I hadn't moved any further on this.

Now that they're back, I'm definitely seeing it again (about 20 different machines in two days last week), so I've started the process of hunting down a trigger cause again. I'll let you know if I find something.

Thanks,
Brian

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