Hi!

> > This is the start of the stable review cycle for the 4.19.209 release.
> > There are 95 patches in this series, all will be posted as a response
> > to this one.  If anyone has any issues with these being applied, please
> > let me know.
> >
> > Responses should be made by Wed, 06 Oct 2021 12:50:17 +0000.
> > Anything received after that time might be too late.
> >
> > The whole patch series can be found in one patch at:
> >         https://www.kernel.org/pub/linux/kernel/v4.x/stable-review/patch-4.19.209-rc1.gz
> > or in the git tree and branch at:
> >         git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.19.y
> > and the diffstat can be found below.
> >
> > thanks,
> >
> > greg k-h
> 
> Regression found on arm, arm64, i386 and x86.
> following kernel crash reported on stable-rc linux-4.19.y.
> 
> metadata:
>   git branch: linux-4.19.y
>   git repo: https://gitlab.com/Linaro/lkft/mirrors/stable/linux-stable-rc
>   git commit: ee3e528d83e91547f386a30677ccb96c28e78218
>   git describe: v4.19.208-96-gee3e528d83e9
>   make_kernelversion: 4.19.209-rc1
>   kernel-config: https://builds.tuxbuild.com/1z2izwX1xMgF2OSYM5EN6ELHEij/config
> 
> 
> Kernel crash:
> --------------
> [   14.900875] BUG: unable to handle kernel NULL pointer dereference
> at 0000000000000000
> [   14.908699] PGD 0 P4D 0
> [   14.911230] Oops: 0002 [#1] SMP PTI
> [   14.914714] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.19.209-rc1 #1
> [   14.921147] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
> 2.2 05/23/2018
> [   14.928531] RIP: 0010:__sk_destruct+0xb9/0x190
> [   14.932965] Code: 48 8b 47 08 48 8d 50 ff a8 01 48 0f 45 fa f0 ff
> 4f 34 0f 84 d9 00 00 00 48 c7 83 00 ff ff ff 00 00 00 00 48 8b bb 78
> ff ff ff <f0> ff 0f 0f 84 a0 00 00 00 48 8b bb 70 ff ff ff e8 32 41 6d
> ff f6

I believe we see the same failure in testing:

https://lava.ciplatform.org/scheduler/job/455022

[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 4.19.209-rc1-gee3e528d83e9-dirty (root@runner-ryfx8chz-project-14394223-concurrent-0xchkx) () #1 SMP Mon Oct 4 17:14:39 UTC 2021
[    0.000000] CPU: ARMv7 Processor [413fc0f2] revision 2 (ARMv7), cr=10c5387d
[    0.000000] CPU: div instructions available: patching division code
...
[    7.215118]      nameserver0=192.168.1.1
[    7.228063] Unable to handle kernel NULL pointer dereference at virtual address 00000000
[    7.236165] pgd = (ptrval)
[    7.238867] [00000000] *pgd=00000000
[    7.242442] Internal error: Oops: 5 [#1] SMP ARM
[    7.247055] Modules linked in:
[    7.250110] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.19.209-rc1-gee3e528d83e9-dirty #1
[    7.258286] Hardware name: Generic RZ/G1 (Flattened Device Tree)
[    7.264318] PC is at __sk_destruct+0xa8/0x11c
[    7.268690] LR is at __sk_destruct+0x4c/0x11c
[    7.273058] pc : [<c0ce244c>]    lr : [<c0ce23f0>]    psr: 60000113


Best regards,
								Pavel
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