Re: [bug report] fstests generic/774 hang again

[Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>]

On Sep 15, 2026 / 11:00, John Garry wrote:
> On 9/15/26 10:34, Shin'ichiro Kawasaki wrote:
> > I observe the fstests test case generic/774 hangs, when I run it for xfs on 8GiB
> > TCMU fileio devices. Actually I once reported this hang symptom in last October,
> > and Darrick and John kindly took some actions [1]. Since then, the hang
> > disappeared and I have not observed the hang almost one year. However, my test
> > system started reporting the hang again last week.
> > 
> > [1] https://lore.kernel.org/linux-xfs/cmk52aqexackyz65phxgme55a3tdrermo3o4skr4lo4pwvvvcp@jmcblnfikbp2/#t
> 
> This was the series to resolve, I think:
> https://lore.kernel.org/fstests/176279908967.605950.2192923313361120314.stgit@frogsfrogsfrogs/T/#t
> 
> As an experiment, can you reduce the file size further, like:
> 
> --- a/tests/generic/774
> +++ b/tests/generic/774
> @@ -29,7 +29,7 @@ aw_bsize=$(_max "$awu_min_write" "$((awu_max_write/4))")
>  fsbsize=$(_get_block_size $SCRATCH_MNT)
> 
>  threads=$(_min "$(($(nproc) * 2 * LOAD_FACTOR))" "100")
> -filesize=$((aw_bsize * threads * 10))
> +filesize=$((aw_bsize * threads))
>  depth=$threads
>  aw_io_size=$((filesize / threads))
>  aw_io_inc=$aw_io_size

Thanks for the response. I repeated the test case 100 times with the change
above, and I did not observe the hang. The change looks avoiding the hang.

> 
> > 
> > FYI, here I attache the kernel message [2].
> 
> Is mainline baseline hanging, i.e. v7.3-rc2?

I will try this out tomorrow.