Running some NFS workload and sending SIGTERM to ganesha (sudo killall
-TERM ganesha.nfsd) will reproduce it.
But you might hit a double-free problem before that - here is a patch that
fixes it.
https://review.gerrithub.io/#/c/398092/
Feel free to rework the patch above.
On Thu, Feb 1, 2018 at 6:59 AM, Daniel Gryniewicz <d...@redhat.com> wrote:
> I've been actually deliberately leaving that crash in. It indicates a
> refcount leak (and is usually the only indicator of a refcount leak, other
> than slowly growing memory over a long time).
>
> Can you get me a reproducer for this? If so, I can track down the leak.
>
> Daniel
>
>
> On 02/01/2018 09:51 AM, Pradeep wrote:
>
>> Hello,
>>
>> In graceful shutdown of ganesha (do_shutdown()), the way object
>> handles are released is first by calling unexport() and then
>> destroy_fsals(). One issue I'm seeing is unexport in MDCACHE will not
>> release objects if refcnt is non-zero (which can happen if files are
>> open). When it comes to destroy_fsals() -> shutdown_handles() ->
>> mdcache_hdl_release() -> ...-> mdcache_lru_clean(), we don't have
>> op_ctx. So it will crashes in mdcache_lru_clean().
>>
>> A simple fix would be to create op_ctx if it is NULL in
>> mdcache_hdl_release(). But I'm wondering if unexport is supposed to
>> free all handles in MDCACHE?
>>
>> This is with 2.6-rc2 in case you want to look at code.
>>
>> Thanks,
>> Pradeep
>>
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>>
>
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