Re: [Dazuko-help] Process hanging up

[Lino Sanfilippo]

Ľuboš Matejíček wrote:
> Yesterday I made a mistake in my test application. I forgot close file
> after it has been scanned. When process already has the maximum number
> of files open,  both applications - user and scanning hung up
> and it was impossible to debug it and even killed (kill -9) them. Only
> computer shutdown helped me to destroy hunged processes.
>
> Today has repeated that with your test application showfiles (I has
> removed close from function dazukofs_return_access) and result is same.
> Application showfiles hang and it is impossible to debug it or kill it.
> Why  is it?  Is a  bug in kernel or modul dazukofs ?
>     Lubos
Hi Lubos,

Thanks for reporting this.
The reason for this behavior is that dazukofs tries to open a file 
descriptor for
the daemon that it assigns an event to. If this assignment fails (in 
this case due to
the failure of allocating a further file descriptor) dazukofs tries 
again and again, hanging
in an endless loop.
And yes, IMO its a bug: dazukofs should at least report  errors like 
this to userspace,
so that the userspace application has the possibiltiy to react somehow 
(probably
terminating the daemon that received the error).
Similar problems may occur if you use dazukofs mounted on a rootsquashed 
nfs, on which dazuko does not have the needed rights to open the files 
for which it wants to report an access to userspace.

Regards,
Lino


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