Re: [BUG] WARNING in bdev_getblk

[Matthew Wilcox]

On Mon, Jun 09, 2025 at 03:54:01PM +0200, Jan Kara wrote:
> Hi!
> 
> On Mon 09-06-25 16:39:15, Xianying Wang wrote:
> > I encountered a kernel WARNING in the function bdev_getblk() when
> > fuzzing the Linux 6.12 kernel using Syzkaller. The crash occurs during
> > a block buffer allocation path, where __alloc_pages_noprof() fails
> > under memory pressure, and triggers a WARNING due to an internal
> > allocation failure.
> 
> Ah, this is a warning about GFP_NOFAIL allocation from direct reclaim:

It's the same discussion we had at LSFMM.  It seems like we have a lot
of "modified syzkaller" people trying this kind of thing.