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Date: Fri, 19 Aug 2022 04:46:35 +0200
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From: Thomas Deutschmann <whissi@whissi.de>
Subject: Re: [REGRESSION] v5.17-rc1+: FIFREEZE ioctl system call hangs
To: Song Liu <song@kernel.org>, Vishal Verma <vverma@digitalocean.com>
Cc: Thorsten Leemhuis <regressions@leemhuis.info>,
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On 2022-08-17 20:29, Thomas Deutschmann wrote:
> I will do another round with 2b7196a219bf (good) <-> 5.18 (bad).

...and this one also ended up in

> first bad commit: [fa55b7dcdc43c1aa1ba12bca9d2dd4318c2a0dbf] Linux 5.16-rc1 

Now I built vanilla 5.18.18 and fsfreeze will hang after FIFREEZE ioctl 
system call after running my reproducer which generated I/O load.

=> So looks like bug is still present, right?

When I now just edit Makefile and set KV <5.16-rc1, i.e.

> diff --git a/Makefile b/Makefile
> index 23162e2bdf14..0f344944d828 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1,7 +1,7 @@
>  # SPDX-License-Identifier: GPL-2.0
>  VERSION = 5
> -PATCHLEVEL = 18
> -SUBLEVEL = 18
> +PATCHLEVEL = 15
> +SUBLEVEL = 0
>  EXTRAVERSION =
>  NAME = Superb Owl
> 

then I can no longer reproduce the problem.

Of course,

> diff --git a/Makefile b/Makefile
> index 23162e2bdf14..0f344944d828 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1,7 +1,7 @@
>  # SPDX-License-Identifier: GPL-2.0
>  VERSION = 5
> -PATCHLEVEL = 18
> -SUBLEVEL = 18
> +PATCHLEVEL = 15
> +SUBLEVEL = 99
>  EXTRAVERSION =
>  NAME = Superb Owl
> 

will freeze again.

For me it looks like kernel is taking a different code path depending on 
KV but I don't know how to proceed. Any idea how to continue debugging this?


-- 
Regards,
Thomas