Re: hotplug lockdep splat (tip)

[Peter Zijlstra]

On Sun, Sep 03, 2017 at 08:59:35AM +0200, Mike Galbraith wrote:
> 
> [  126.626908] Unregister pv shared memory for cpu 1
> [  126.631041] 
> [  126.631269] ======================================================
> [  126.632442] WARNING: possible circular locking dependency detected
> [  126.633599] 4.13.0.g06260ca-tip-lockdep #2 Tainted: G            E  
> [  126.634380] ------------------------------------------------------
> [  126.635124] stress-cpu-hotp/3156 is trying to acquire lock:
> [  126.635804]  ((complete)&st->done){+.+.}, at: [<ffffffff8108d19a>] takedown_cpu+0x8a/0xf0
> [  126.636809] 
> [  126.636809] but task is already holding lock:
> [  126.637567]  (sparse_irq_lock){+.+.}, at: [<ffffffff81107ac7>] irq_lock_sparse+0x17/0x20
> [  126.638665] 

https://lkml.kernel.org/r/20170829193416.GC32112@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

I still need to write a coherent Changelog and comments for that :/