Re: ccache: FATAL: Could not create xxx.o.tmp.stdout.yyy.zzz (permission denied?)

Verify that the tmp file is unique based on the machine and user. If it
does not have the user and machine in the name it *may* be possible for a
race condition.

There was a race condition that I fixed that could occur when the cache
directory did not exist and multiple processes were trying to create it for
the first time. The fix was in a function that creates paths so it may have
been possible that a race condition could occur when any directory was
created. When the error occurred was the cache fully populated (all the
directories created)?


On Thu, Nov 1, 2012 at 4:40 PM, Lalit Chhabra <[email protected]>wrote:

> Hi,
>
>  We have deployed ccache 3.1.7 (over NFS), with the cache being shared
> amongst about 30-40 people. The cache max size is configured to be 20G. We
> primarily compile c++ files with g++, each of which take less than a couple
> of minutes to compile. This has mostly been very sucessful, except that
> every once in a while, we get the above FATAL error from ccache. (I have
> seen this 2 times, in the past 4 months that we have been using ccache.)
>
>  My initial guess was that there is some race condition between one users'
> ccache process doing a clean-up, while another users' compile is going on.
> But looking at the code, temp files have to be at least one hour old for
> them to get cleaned up.
>
>  Another odd thing that I have seen (just once so far), is that the cache
> max size got reduced to 18.8G (which seems to be close to 20G*15/16). This
> caused a lot more of the "FATAL: Could not create..." messages to appear,
> until I reset the cache size back to 20G.
>
>  I am not sure if both of these observations are related. Any ideas what
> could be going on?
>
>  Thanks,
>  Lalit Chhabra
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