linux-kernel - Re: [PATCH 6.9 000/281] 6.9.6-rc1 review

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Date: Thu, 20 Jun 2024 16:20:12 +0200
From: David Hildenbrand <david@...hat.com>
To: Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org,
 patches@...ts.linux.dev, linux-kernel@...r.kernel.org,
 torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
 linux@...ck-us.net, shuah@...nel.org, patches@...nelci.org,
 lkft-triage@...ts.linaro.org, pavel@...x.de, jonathanh@...dia.com,
 f.fainelli@...il.com, sudipm.mukherjee@...il.com, srw@...dewatkins.net,
 rwarsow@....de, conor@...nel.org, allen.lkml@...il.com, broonie@...nel.org,
 Miaohe Lin <linmiaohe@...wei.com>, Arnd Bergmann <arnd@...db.de>,
 Dan Carpenter <dan.carpenter@...aro.org>, Cgroups <cgroups@...r.kernel.org>,
 linux-mm <linux-mm@...ck.org>, Baolin Wang <baolin.wang@...ux.alibaba.com>,
 jbeulich@...e.com, LTP List <ltp@...ts.linux.it>
Subject: Re: [PATCH 6.9 000/281] 6.9.6-rc1 review

On 20.06.24 16:02, Naresh Kamboju wrote:
> On Thu, 20 Jun 2024 at 19:23, David Hildenbrand <david@...hat.com> wrote:
>>
>> On 20.06.24 15:14, Naresh Kamboju wrote:
>>> On Thu, 20 Jun 2024 at 17:59, Greg Kroah-Hartman
>>> <gregkh@...uxfoundation.org> wrote:
>>>>
>>>> On Thu, Jun 20, 2024 at 05:21:09PM +0530, Naresh Kamboju wrote:
>>>>> On Wed, 19 Jun 2024 at 18:41, Greg Kroah-Hartman
>>>>> <gregkh@...uxfoundation.org> wrote:
>>>>>>
>>>>>> This is the start of the stable review cycle for the 6.9.6 release.
>>>>>> There are 281 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 Fri, 21 Jun 2024 12:55:11 +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/v6.x/stable-review/patch-6.9.6-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-6.9.y
>>>>>> and the diffstat can be found below.
>>>>>>
>>>>>> thanks,
>>>>>>
>>>>>> greg k-h
>>>>>
>>>>> There are two major issues on arm64 Juno-r2 on Linux stable-rc 6.9.6-rc1
>>>>>
>>>>> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
>>>>>
>>>>> 1)
>>>>> The LTP controllers cgroup_fj_stress test cases causing kernel crash
>>>>> on arm64 Juno-r2 with
>>>>> compat mode testing with stable-rc 6.9 kernel.
>>>>>
>>>>> In the recent past I have reported this issues on Linux mainline.
>>>>>
>>>>> LTP: fork13: kernel panic on rk3399-rock-pi-4 running mainline 6.10.rc3
>>>>>     - https://lore.kernel.org/all/CA+G9fYvKmr84WzTArmfaypKM9+=Aw0uXCtuUKHQKFCNMGJyOgQ@mail.gmail.com/
>>>>>
>>>>> it goes like this,
>>>>>     Unable to handle kernel NULL pointer dereference at virtual address
>>>>>     ...
>>>>>     Insufficient stack space to handle exception!
>>>>>     end Kernel panic - not syncing: kernel stack overflow
>>>>>
>>
>> How is that related to 6.9.6-rc1? That report is from mainline (6.10.rc3).
>>
>> Can you share a similar kernel dmesg output from  the issue on 6.9.6-rc1?
> 
> I request you to use this link for detailed boot log, test log and crash log.
>   - https://lkft.validation.linaro.org/scheduler/job/7687060#L23314
> 
> Few more logs related to build artifacts links provided in the original
> email thread and bottom of this email.
> 
> crash log:
> ---
> 

Thanks, so this is something different than the

"BUG: Bad page map in process fork13
  BUG: Bad rss-counter state mm:"

stuff on mainline you referenced.

Looks like some recursive exception until we exhausted the stack.


Trying to connect the dots here, can you enlighten me how this is 
related to the fork13 mainline report?

> [ 0.000000] Booting Linux on physical CPU 0x0000000100 [0x410fd033]
> [ 0.000000] Linux version 6.9.6-rc1 (tuxmake@...make)
> (aarch64-linux-gnu-gcc (Debian 13.2.0-12) 13.2.0, GNU ld (GNU Binutils
> for Debian) 2.42) #1 SMP PREEMPT @1718817000
> ...
> [ 1786.336761] Unable to handle kernel NULL pointer dereference at
> virtual address 0000000000000070
> [ 1786.345564] Mem abort info:
> [ 1786.348359]   ESR = 0x0000000096000004
> [ 1786.352112]   EC = 0x25: DABT (current EL), IL = 32 bits
> [ 1786.357434]   SET = 0, FnV = 0
> [ 1786.360492]   EA = 0, S1PTW = 0
> [ 1786.363637]   FSC = 0x04: level 0 translation fault
> [ 1786.368523] Data abort info:
> [ 1786.371405]   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
> [ 1786.376900]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
> [ 1786.381960]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
> [ 1786.387284] Unable to handle kernel NULL pointer dereference at
> virtual address 0000000000000070
> [ 1786.387293] Insufficient stack space to handle exception!
> [ 1786.387296] ESR: 0x0000000096000047 -- DABT (current EL)
> [ 1786.387302] FAR: 0xffff80008399ffe0
> [ 1786.387306] Task stack:     [0xffff8000839a0000..0xffff8000839a4000]
> [ 1786.387312] IRQ stack:      [0xffff8000837f8000..0xffff8000837fc000]
> [ 1786.387319] Overflow stack: [0xffff00097ec95320..0xffff00097ec96320]
> [ 1786.387327] CPU: 4 PID: 0 Comm: swapper/4 Not tainted 6.9.6-rc1 #1
> [ 1786.387338] Hardware name: ARM Juno development board (r2) (DT)
> [ 1786.387344] pstate: a00003c5 (NzCv DAIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> [ 1786.387355] pc : _prb_read_valid (kernel/printk/printk_ringbuffer.c:2109)
> [ 1786.387374] lr : prb_read_valid (kernel/printk/printk_ringbuffer.c:2183)
> [ 1786.387385] sp : ffff80008399ffe0
> [ 1786.387390] x29: ffff8000839a0030 x28: ffff000800365f00 x27: ffff800082530008
> [ 1786.387407] x26: ffff8000834e33b8 x25: ffff8000839a00b0 x24: 0000000000000001
> [ 1786.387423] x23: ffff8000839a00a8 x22: ffff8000830e3e40 x21: 0000000000001e9e
> [ 1786.387438] x20: 0000000000000000 x19: ffff8000839a01c8 x18: 0000000000000010
> [ 1786.387453] x17: 72646461206c6175 x16: 7472697620746120 x15: 65636e6572656665
> [ 1786.387468] x14: 726564207265746e x13: 3037303030303030 x12: 3030303030303030
> [ 1786.387483] x11: 2073736572646461 x10: ffff800083151ea0 x9 : ffff80008014273c
> [ 1786.387498] x8 : ffff8000839a0120 x7 : 0000000000000000 x6 : 0000000000000e9f
> [ 1786.387512] x5 : ffff8000839a00c8 x4 : ffff8000837157c0 x3 : 0000000000000000
> [ 1786.387526] x2 : ffff8000839a00b0 x1 : 0000000000000000 x0 : ffff8000830e3f58
> [ 1786.387542] Kernel panic - not syncing: kernel stack overflow
> [ 1786.387549] SMP: stopping secondary CPUs
> [ 1787.510055] SMP: failed to stop secondary CPUs 0,4
> [ 1787.510065] Kernel Offset: disabled
> [ 1787.510068] CPU features: 0x4,00001061,e0100000,0200421b
> [ 1787.510076] Memory Limit: none
> [ 1787.680436] ---[ end Kernel panic - not syncing: kernel stack overflow ]---


-- 
Cheers,

David / dhildenb