On 08/14/2019 02:09 PM, Mike Christie wrote:
> On 08/14/2019 07:35 AM, Marc Schöchlin wrote:
>>>> 3. I wonder if we are hitting a bug with PF_MEMALLOC Ilya hit with krbd.
>>>> He removed that code from the krbd. I will ping him on that.
>>
>> Interesting. I activated Coredumps for that processes - probably we can
>> find something interesting here...
>>
> 
> Can you replicate the problem with timeout=0 on a 4.4 kernel (ceph
> version does not matter as long as its known to hit the problem). When
> you start to see IO hang and it gets jammed up can you do:
> 
> dmesg -c; echo w >/proc/sysrq-trigger; dmesg -c >waiting-tasks.txt
> 
> and give me the waiting-tasks.txt so I can check if we are stuck in the
> kernel waiting for memory.

Don't waste your time. I found a way to replicate it now.

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