Re: [PATCH 5.7 00/14] 5.7.1-rc1 review

[Naresh Kamboju]

On Sun, 7 Jun 2020 at 16:50, Greg Kroah-Hartman
<gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
>
> On Sat, Jun 06, 2020 at 09:19:53PM +0530, Naresh Kamboju wrote:
> > On Fri, 5 Jun 2020 at 19:46, Greg Kroah-Hartman
> > <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
> > >
> > > This is the start of the stable review cycle for the 5.7.1 release.
> > > There are 14 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 Sun, 07 Jun 2020 13:54:56 +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/v5.x/stable-review/patch-5.7.1-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-5.7.y
> > > and the diffstat can be found below.
> > >
> > > thanks,
> > >
> > > greg k-h
> >
> > Results from Linaroâs test farm.
> >
> > While running kselftest memfd_test case the kernel panic noticed on i386
> > which started with kernel BUG and followed by kernel panic.
> >
> > steps to reproduce: (Not always reproducible)
> >           - cd /opt/kselftests/mainline/memfd/
> >           - ./run_fuse_test.sh || true
> >           - ./run_hugetlbfs_test.sh || true
> >
> > [  417.473220] run_hugetlbfs_t (10826): drop_caches: 3
> > [  417.491120] audit: type=1701 audit(1591388532.357:87503):
> > auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=10829
> > comm=\"memfd_test\" exe=\"/opt/kselftests/mainline/memfd/memfd_test\"
> > sig=6 res=1
> > [  417.511294] BUG: kernel NULL pointer dereference, address: 00000043
> > [  417.517569] #PF: supervisor read access in kernel mode
> > [  417.522699] #PF: error_code(0x0000) - not-present page
> > [  417.527830] *pde = 00000000
> > [  417.530707] Oops: 0000 [#2] SMP
> > [  417.533846] CPU: 3 PID: 10829 Comm: memfd_test Tainted: G      D W
> >        5.7.1-rc1 #1
> > [  417.541845] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
> > 2.0b 07/27/2017
> > [  417.549327] EIP: kmem_cache_alloc_trace+0x81/0x2b0
> > <>
> > [  931.776242] Kernel panic - not syncing: Attempted to kill init!
> > exitcode=0x00000009
> > [  931.783933] Kernel Offset: 0x1ce00000 from 0xc1000000 (relocation
> > range: 0xc0000000-0xf77fdfff)
> > [  931.792627] ---[ end Kernel panic - not syncing: Attempted to kill
> > init! exitcode=0x00000009 ]---
>
> Did you see this on Linus's tree too?

Yes.
I have noticed 4 out of 10 kselftest full runs.

>
> Is it a regression from 5.7.0?

It is a regression on Linus 's tree and the same problem was noticed on
stable-rc 5.7 branch.

- Naresh