[OpenAFS-devel] 1.3.78 on AIX 5.1 broken, stack issues

[Niklas Edmundsson]

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Hi!

I finally found some time to test openafs 1.3 on AIX 5.1, and the 
results indicates that there are some issues with stack size...

My test machine is a single CPU AIX5.1 machine running the 32bit 
kernel. Harald Barths AIX 5.2 test machine was running the 64bit 
kernel I think.

On the first try (compiling plain openafs-1.3.78), the machine dumped 
as soon I obtained an AFS token.

The next approach was to make openafs handle AIX 5.1 the same way as 
AIX 5.2 (ie. a modification of the patch Harald did). This means a 
128kB stack instead of 48kB. This way, I could log in and obtain an 
AFS token, but 'find /afs/some/where -type f >/dev/null' fails on 
random files with messages like:
find: 0652-019 The status on ./a2273475.pdf is not valid.

Suspecting more stack smashage, I increased the stack to 512kB. Now it 
works better, but it only takes more users with tokens to make the 
above "find"-test fail.

The result is a bit better than dying-upon-login though, so I have 
attached the resulting patch. Since Harald only tested hist patch on 
the 64bit kernel I assume that my results are valid for AIX 5.2 on 
32bit too, I don't have a chrp test machine handy to verify that 
though.

Someone with more Clue<tm> on the openafs innards might want to look 
into this, since 512kB stack in kernel space really should be enough. 
I really have no idea where to look, and finding that the issue was 
seemingly stack related was more luck than skill on my part ;)

Ideas?

/Nikke
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