Re: Need some pointers to debug a target hang

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Hi Johannes & Zhu,

On Tue, 2016-10-18 at 23:29 -0700, Nicholas A. Bellinger wrote:
> On Tue, 2016-10-18 at 19:35 +0200, Johannes Thumshirn wrote:
> > On Tue, Oct 18, 2016 at 09:01:34AM +0200, Johannes Thumshirn wrote:
> > 
> > [...]
> > 
> > > > 
> > > > This is likely the missing SCF_ACK_KREF assignment in >= v4.1.y:
> > > > 
> > > > http://www.spinics.net/lists/target-devel/msg13530.html
> > 
> > Sorry to disappoint you but it didn't fix my issue. Is there any debug data I
> > can give you, or do you have an advice where I could start looking?
> > 
> > I have to admit I only tested the patch on our downstream kernel and not the
> > upstream kernel, I'll repeat the tests on 4.8 final tomorrow.
> > 
> 
> Is it possible to generate vmcore to have a look in crash + gdb..?
> 
> 

Just curious if you've been able to verify the above patch for
v4.8.y iscsi-target ports on your specific config(s)..?

To confirm, using v4.1.y + patch I've not run into any further
se_cmd->cmd_kref leaks and/or hung tasks with iscsi-target ports due to
high backend device I/O latency, resulting in host timeouts + ABORT_TASK
+ session reinstatement to occur while waiting for outstanding se_cmd
backend I/O to complete.



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