On 04/06/2017 09:04 PM, Michael Ellerman wrote: > Tyrel Datwyler <tyr...@linux.vnet.ibm.com> writes: > >> On 04/06/2017 03:27 AM, Sachin Sant wrote: >>> On a POWER8 LPAR running 4.11.0-rc5, a hot unplug operation on >>> any I/O adapter results in the following warning >>> >>> This problem has been in the code for some time now. I had first seen this >>> in >>> -next tree. >>>
<snip> >>> Have attached the dmesg log from the system. Let me know if any additional >>> information is required to help debug this problem. >> >> I remember you mentioning this when the issue was brought up for CPUs. I >> assume the case is the same here where the issue is only seen with >> adapters that were hot-added after boot (ie. hot-remove of adapter >> present at boot doesn't trip the warning)? > > So who's fixing this? I started looking at it when Bharata submitted a patch trying to fix the issue for CPUs, but got side tracked by other things. I suspect that this underflow has actually been an issue for quite some time, and we are just now becoming aware of it thanks to the recount_t patchset being merged. I'll look into it again this week. -Tyrel > > cheers >
