Am 2022-06-30 21:35, schrieb Nathan Chancellor:
On Thu, Jun 30, 2022 at 03:11:58PM +0200, Michael Walle wrote:
Hi,
I'm not sure it these are the correct recipients, feel free to CC
others.
Since next-20220630 (or maybe also since next-20220629) I'm getting
the
[ 3.707900] WARNING: CPU: 0 PID: 38 at fs/kernfs/dir.c:531
kernfs_put.part.0+0x1a0/0x1d4
[ 3.716313] kernfs_put: console/active: released with incorrect
active_ref 0
on both arm and arm64 boards. See for example:
https://linux.kernelci.org/test/case/id/62bd840b330c4851eaa39c16/
I have the console set in the device tree as well as on the
commandline.
Up until recently that wasn't a problem and I guess that should be a
valid
configuration. That being said, the warn() will go away if I remove
the
console= parameter on the commandline.
I haven't had time to do a bisect yet. That will probably my next
step;
or maybe kernelci will already do that for me, Guillaume? Unless
someone
has some more insights/ideas.
I noticed this as well when booting ARCH=um defconfig.
I ended up doing a bisect against next-20220630 and I landed on the
driver-core merge (5732b42edfd18ee888e127fa13d425ed3ed1bef3). I did two
more bisects to figure out that there is some sort of contextual
contlict between commit 5831788afb17 ("Revert "printk: add kthread
console printers"") and commit b8f35fa1188b ("kernfs: Change
kernfs_notify_list to llist."), as it is only when those two changes
are
present that this issue occurs. I am happy to provide more information
if necessary.
Thanks for the info.
I can confirm that reverting b8f35fa1188b will fix the error. I couldn't
revert 5831788afb17 though, didn't apply cleanly.
-michael
