Re: [Bugme-new] [Bug 10737] New: pktgen procfs problem

Patrick McHardy wrote:

Andrew Morton wrote:

quoted

On Sun, 18 May 2008 03:39:42 +0200 Patrick McHardy [off-list ref] 
wrote:

 

quoted

I've been looking into the same problem, without much success so
far. The problem appears to affect any /proc/net file, but not
files outside of /proc/net, so I'm guessing its net-ns related.
A testcase found by Ben Greear is opening the file multiple times:

# /tmp/open /proc/net/kpktgen_0

=> refcnt goes to 1

^C

=> refcnt goes to 0

Without ^C and opening the file a second time:

# /tmp/open /proc/net/kpktgen_0

=> refcnt goes to 2 (sometimes also 11)

^C

=> refcnt stays at previous value.

The refcnt even leaks if the file can't be successfully opened,
for example because of lacking permissions.
    

urgh.  Is any of this known to be post-2.6.25?
  

2.6.25 is also affected. I don't know about earlier kernels.

Some more information: the problem seems to occur only if
the file is opened by two different processes.

I'm starting a bisection now.