[Gluster-devel] [Gluster-users] Memory leak in GlusterFS FUSE client

[Xavier Hernandez]

If this message appears way before the volume is unmounted, can you try 
to start the volume manually using this command and repeat the tests ?

glusterfs --fopen-keep-cache=off --volfile-server=<server> 
--volfile-id=/<volume> <mount point>

This will prevent invalidation requests to be sent to the kernel, so 
there shouldn't be any memory leak even if the worker thread exits 
prematurely.

If that solves the problem, we could try to determine the cause of the 
premature exit and solve it.

Xavi


On 20/01/16 10:08, Oleksandr Natalenko wrote:
> Yes, there are couple of messages like this in my logs too (I guess one
> message per each remount):
>
> ===
> [2016-01-18 23:42:08.742447] I [fuse-bridge.c:3875:notify_kernel_loop] 0-
> glusterfs-fuse: kernel notifier loop terminated
> ===
>
> On середа, 20 січня 2016 р. 09:51:23 EET Xavier Hernandez wrote:
>> I'm seeing a similar problem with 3.7.6.
>>
>> This latest statedump contains a lot of gf_fuse_mt_invalidate_node_t
>> objects in fuse. Looking at the code I see they are used to send
>> invalidations to kernel fuse, however this is done in a separate thread
>> that writes a log message when it exits. On the system I'm seeing the
>> memory leak, I can see that message in the log files:
>>
>> [2016-01-18 23:04:55.384873] I [fuse-bridge.c:3875:notify_kernel_loop]
>> 0-glusterfs-fuse: kernel notifier loop terminated
>>
>> But the volume is still working at this moment, so any future inode
>> invalidations will leak memory because it was this thread that should
>> release it.
>>
>> Can you check if you also see this message in the mount log ?
>>
>> It seems that this thread terminates if write returns any error
>> different than ENOENT. I'm not sure if there could be any other error
>> that can cause this.
>>
>> Xavi
>>
>> On 20/01/16 00:13, Oleksandr Natalenko wrote:
>>> Here is another RAM usage stats and statedump of GlusterFS mount
>>> approaching to just another OOM:
>>>
>>> ===
>>> root     32495  1.4 88.3 4943868 1697316 ?     Ssl  Jan13 129:18
>>> /usr/sbin/
>>> glusterfs --volfile-server=server.example.com --volfile-id=volume
>>> /mnt/volume ===
>>>
>>> https://gist.github.com/86198201c79e927b46bd
>>>
>>> 1.6G of RAM just for almost idle mount (we occasionally store Asterisk
>>> recordings there). Triple OOM for 69 days of uptime.
>>>
>>> Any thoughts?
>>>
>>> On середа, 13 січня 2016 р. 16:26:59 EET Soumya Koduri wrote:
>>>> kill -USR1
>>>
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>
>