[LTP] [PATCH] lsmod01: parse a copy of /proc/modules

[Stanislav Kholmanskikh]

On 08/29/2016 03:50 PM, Cyril Hrubis wrote:
> Hi!
>> In my environment, if TMPDIR is on NFSv4, this test case fails with:
>>
>> lsmod01 1 TFAIL : lsmod output different from /proc/modules.
>>   21c21
>>   < sunrpc 207591 28
>>   ---
>>   > sunrpc 207591 29
>>
>> To avoid such problems I separate the process of getting data from
>> /proc/modules and the process of parsing it in the pipe structure.
> 
> So the sunrpc module gets its ref counter incremented from somewhere of
> the nfs kernel code once we open file on NFS?

Looks so. I hava a share mounted from localhost:

[root@skholman-m7 mnt]# mount|grep mnt
127.0.0.1:/opt on /mnt type nfs
(rw,vers=4,addr=127.0.0.1,clientaddr=127.0.0.1)
[root@skholman-m7 mnt]# awk '{print $1, $2, $3}' /proc/modules|sort >
/tmp/not_nfs
[root@skholman-m7 mnt]# awk '{print $1, $2, $3}' /proc/modules|sort > nfs
[root@skholman-m7 mnt]# grep sunrpc nfs
sunrpc 207591 29
[root@skholman-m7 mnt]# grep sunrpc /tmp/not_nfs
sunrpc 207591 28
[root@skholman-m7 mnt]#



> 
> But shouldn't the shell open the temp file the output is redirected to
> before it executes the command line anyway?
>