Re: [REGRESSION] v5.17-rc1+: FIFREEZE ioctl system call hangs

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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



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