Re: [bug report] kernel BUG at mm/hugetlb.c:5868! triggered by blktests nvme/tcp nvme/029

Re: [bug report] kernel BUG at mm/hugetlb.c:5868! triggered by blktests nvme/tcp nvme/029

[Yi Zhang]

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On Fri, Nov 21, 2025 at 3:44 PM Hannes Reinecke <hare@suse.de> wrote:

> On 11/20/25 16:18, Yi Zhang wrote:
> > I did more testing today, and found that this issue cannot be
> > reproduced if I don't set the nr_hugepages
> >
> >
> https://github.com/linux-blktests/blktests/blob/master/tests/nvme/029#L71
> >
>
> But is the inverse also true, namely _can_ you reproduce it when
> nr_hugepages is set?
>
> Yes, it's now 100% reproduced in my environment.
CCed linux-mm@



> After all, there seems to be an issue with hugepages, so it's not
> surprising that we don't see it if we don't use hugepages...
>
> Cheers
>
> Hannes
> --
> Dr. Hannes Reinecke                  Kernel Storage Architect
> hare@suse.de                                +49 911 74053 688
> SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
> HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich
>
>

-- 
Best Regards,
  Yi Zhang

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Re: [bug report] kernel BUG at mm/hugetlb.c:5868! triggered by blktests nvme/tcp nvme/029

[David Hildenbrand (Arm)]

On 11/21/25 11:32, Yi Zhang wrote:
> 
> 
> On Fri, Nov 21, 2025 at 3:44 PM Hannes Reinecke <hare@suse.de 
> <mailto:hare@suse.de>> wrote:
> 
>     On 11/20/25 16:18, Yi Zhang wrote:
>      > I did more testing today, and found that this issue cannot be
>      > reproduced if I don't set the nr_hugepages
>      >
>      > https://github.com/linux-blktests/blktests/blob/master/tests/
>     nvme/029#L71 <https://github.com/linux-blktests/blktests/blob/
>     master/tests/nvme/029#L71>
>      >
> 
>     But is the inverse also true, namely _can_ you reproduce it when
>     nr_hugepages is set?
> 
> Yes, it's now 100% reproduced in my environment.
> CCed linux-mm@

Stumbling over this mail in linux-mm, do we have some more information 
about the problem we are running into?

-- 
Cheers,

David