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From:   Naresh Kamboju <naresh.kamboju@linaro.org>
Date:   Wed, 8 Apr 2020 15:16:45 +0530
Message-ID: <CA+G9fYsyETNoV58oyrBtb2o_vyFi1MPUNkZ9uUZK6uRCg5OK5w@mail.gmail.com>
Subject: Re: [PATCH 5.6 00/30] 5.6.3-rc2 review
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     open list <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Guenter Roeck <linux@roeck-us.net>,
        Shuah Khan <shuah@kernel.org>, patches@kernelci.org,
        Ben Hutchings <ben.hutchings@codethink.co.uk>,
        lkft-triage@lists.linaro.org,
        linux- stable <stable@vger.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@vger.kernel.org>
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On Tue, 7 Apr 2020 at 22:09, Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
>
> This is the start of the stable review cycle for the 5.6.3 release.
> There are 30 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 Thu, 09 Apr 2020 15:46:32 +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-=
5.6.3-rc2.gz
> or in the git tree and branch at:
>         git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable=
-rc.git linux-5.6.y
> and the diffstat can be found below.
>
> thanks,
>
> greg k-h

Results from Linaro=E2=80=99s test farm.
No regressions on arm64, arm, x86_64, and i386.

There are three kernel warnings on stable-rc 5.6 two of them are also
present in Linus's tree.
So these reported issues are not the release blockers.
The Source of these warnings are reported while running kselftests.

1) This warning reported on the mailing list and discussion is active.
Warning reported on x86_64, i386, arm and arm64.

[  346.741358] kselftest: Running tests in lib
[  346.872415] test_printf: loaded.
[  346.876442] BUG: kernel NULL pointer dereference, address: 00000000
[  346.882703] #PF: supervisor read access in kernel mode
[  346.887844] #PF: error_code(0x0000) - not-present page
[  346.892990] *pde =3D 00000000
[  346.895877] Oops: 0000 [#1] SMP
[  346.899025] CPU: 1 PID: 6060 Comm: modprobe Tainted: G        W
    5.6.3-rc2 #1
[  346.906772] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
2.0b 07/27/2017
[  346.914261] EIP: ida_free+0x61/0x130

ref:
https://lore.kernel.org/linux-kselftest/CAFd5g46Bwd8HS9-xjHLh_rB59Nfw8iAnM6=
aFe0QPcveewDUT6g@mail.gmail.com/T/#me600a8093338a485291361aaf9439e8b2f08a20=
f

2) This warning is reported on the mailing list and waiting for response,
warning reported on i386 kernel image running x86_64 device.

[  166.488084] ------------[ cut here ]------------
[  166.492749] WARNING: CPU: 2 PID: 1456 at
/usr/src/kernel/kernel/locking/lockdep.c:1119
lockdep_register_key+0xb0/0xf0
[  166.503357] Modules linked in: algif_hash af_alg
x86_pkg_temp_thermal fuse [last unloaded: test_bpf]
[  166.512481] CPU: 2 PID: 1456 Comm: ip Not tainted 5.6.3-rc2 #1
[  166.518306] Hardware name: Supermicro SYS-5019S-ML/X11SSH-F, BIOS
2.0b 07/27/2017
[  166.525776] EIP: lockdep_register_key+0xb0/0xf0

ref:
https://lore.kernel.org/netdev/CA+G9fYt7-R-_fVDeiwj=3DsVvBQ-456Pm1oFFtM5Hm_=
94nN-tA+w@mail.gmail.com/T/#u

3) This warning is only noticed on stable rc 5.6 and 5.5 seen only on arm64=
.
This needs to be investigated.

[  386.349099] kselftest: Running tests in ftrace
[  393.984018]
[  393.984290] =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D
[  393.984781] WARNING: suspicious RCU usage
[  393.988690] 5.6.3-rc2 #1 Not tainted
[  393.992679] -----------------------------
[  393.996327] /usr/src/kernel/include/trace/events/ipi.h:36
suspicious rcu_dereference_check() usage!
[  394.000241]
[  394.000241] other info that might help us debug this:
[  394.000241]
[  394.009094]
[  394.009094] RCU used illegally from idle CPU!
[  394.009094] rcu_scheduler_active =3D 2, debug_locks =3D 1
[  394.017084] RCU used illegally from extended quiescent state!
[  394.028187] 1 lock held by swapper/3/0:
[  394.033826]  #0: ffff80001237b6a8 (max_trace_lock){....}, at:
check_critical_timing+0x7c/0x1a8

ref:
https://lore.kernel.org/linux-kselftest/CA+G9fYtYRc_mKPDN-Gryw7fhjPNGBUP=3D=
KemTXaXR6UBU94M3hw@mail.gmail.com/T/#u


Summary
------------------------------------------------------------------------

kernel: 5.6.3-rc2
git repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stab=
le-rc.git
git branch: linux-5.6.y
git commit: f106acd0db7c11e0208a2ecbeb0f7c52fc6c455a
git describe: v5.6.2-31-gf106acd0db7c
Test details: https://qa-reports.linaro.org/lkft/linux-stable-rc-5.6-oe/bui=
ld/v5.6.2-31-gf106acd0db7c


No regressions (compared to build v5.6.2)

No fixes (compared to build v5.6.2)

Ran 22476 total tests in the following environments and test suites.

Environments
--------------
- dragonboard-410c
- hi6220-hikey
- i386
- juno-r2
- nxp-ls2088
- qemu_arm
- qemu_arm64
- qemu_i386
- qemu_x86_64
- x15
- x86
- x86-kasan

Test Suites
-----------
* build
* install-android-platform-tools-r2600
* install-android-platform-tools-r2800
* kselftest
* kvm-unit-tests
* libgpiod
* libhugetlbfs
* linux-log-parser
* ltp-cap_bounds-tests
* ltp-commands-tests
* ltp-cpuhotplug-tests
* ltp-crypto-tests
* ltp-cve-tests
* ltp-dio-tests
* ltp-fcntl-locktests-tests
* ltp-filecaps-tests
* ltp-fs-tests
* ltp-fs_bind-tests
* ltp-fs_perms_simple-tests
* ltp-fsx-tests
* ltp-hugetlb-tests
* ltp-io-tests
* ltp-ipc-tests
* ltp-math-tests
* ltp-nptl-tests
* ltp-pty-tests
* ltp-sched-tests
* ltp-securebits-tests
* perf
* v4l2-compliance
* ltp-containers-tests
* ltp-mm-tests
* ltp-open-posix-tests
* ltp-syscalls-tests
* network-basic-tests
* spectre-meltdown-checker-test

--=20
Linaro LKFT
https://lkft.linaro.org