linux-kernel - Re: [PATCH 6.1 000/217] 6.1.95-rc1 review [parisc64/C3700 boot failures]

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Date: Sat, 22 Jun 2024 17:49:28 +0200
From: Helge Deller <deller@....de>
To: Guenter Roeck <linux@...ck-us.net>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org
Cc: patches@...ts.linux.dev, linux-kernel@...r.kernel.org,
 torvalds@...ux-foundation.org, akpm@...ux-foundation.org, 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, Oleg Nesterov <oleg@...hat.com>,
 linux-parisc@...r.kernel.org,
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>
Subject: Re: [PATCH 6.1 000/217] 6.1.95-rc1 review [parisc64/C3700 boot
 failures]

On 6/22/24 17:34, Guenter Roeck wrote:
> On 6/22/24 08:13, Helge Deller wrote:
>> On 6/22/24 16:58, Guenter Roeck wrote:
>>> [ Copying parisc maintainers - maybe they can test on real hardware ]
>>>
>>> On 6/19/24 05:54, Greg Kroah-Hartman wrote:
>>>> This is the start of the stable review cycle for the 6.1.95 release.
>>>> There are 217 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.
>>>>
>>> ...
>>>> Oleg Nesterov <oleg@...hat.com>
>>>>      zap_pid_ns_processes: clear TIF_NOTIFY_SIGNAL along with TIF_SIGPENDING
>>>>
>>>
>>> I can not explain it, but this patch causes all my parisc64 (C3700)
>>> boot tests to crash. There are lots of memory corruption BUGs such as
>>>
>>> [    0.000000] =============================================================================
>>> [    0.000000] BUG kmalloc-96 (Not tainted): Padding overwritten. 0x0000000043411dd0-0x0000000043411f5f @offset=3536
>>>
>>> ultimately followed by
>>>
>>> [    0.462562] Unaligned handler failed, ret = -14
>>> ...
>>> [    0.469160]  IAOQ[0]: idr_alloc_cyclic+0x48/0x118
>>> [    0.469372]  IAOQ[1]: idr_alloc_cyclic+0x54/0x118
>>> [    0.469548]  RP(r2): __kernfs_new_node.constprop.0+0x160/0x420
>>> [    0.469782] Backtrace:
>>> [    0.469928]  [<00000000404af108>] __kernfs_new_node.constprop.0+0x160/0x420
>>> [    0.470285]  [<00000000404b0cac>] kernfs_new_node+0xbc/0x118
>>> [    0.470523]  [<00000000404b158c>] kernfs_create_empty_dir+0x54/0xf0
>>> [    0.470756]  [<00000000404b665c>] sysfs_create_mount_point+0x4c/0xb0
>>> [    0.470996]  [<00000000401181cc>] cgroup_init+0x5b4/0x738
>>> [    0.471213]  [<0000000040102220>] start_kernel+0x1238/0x1308
>>> [    0.471429]  [<0000000040107c90>] start_parisc+0x188/0x1d0
>>> ...
>>> [    0.474956] Kernel panic - not syncing: Attempted to kill the idle task!
>>> SeaBIOS wants SYSTEM RESET.
>>>
>>> This is with qemu v9.0.1.
>>
>> Just to be sure, did you tested the same kernel on physical hardware as well?
>>
>
> No, I don't have hardware. I only have qemu. That is why I copied you and
> the parisc mailing list.

Yes, sorry, I saw your top line in the mail after I already sent my reply....

> I would hope that someone can either confirm that
> this is a real problem or that it is qemu related. If it is qemu related,
> I'll just stop testing c3700 64-bit support with qemu on v6.1.y and other
> branches if/when the problem shows up there as well.

I just booted 6.1.95 successfully in qemu and on my physical C3700 machine.
I assume the problem can be reproduced with your .config ?
Please send it to me off-list, then I can try again.

I know there are still some issues with the 64-bit hppa emulation in qemu,
which are quite hard for me to trigger and to find the cause.
So, maybe you now found one easier-to-trigger reproducer? :-)

Helge

>> Please note, that 64-bit hppa (C3700) support in qemu was just recently added
>> and is still considered experimental.
>> So, maybe it's not a bug in the source, but in qemu...?!?
>>
>
> Sure, that is possible, though it is a bit unusual that it is only seen
> in 6.1.95 and not in any other branches or releases.
>
> In summary, please see this report as "This is a problem seen in qemu.
> It may or may not be seen on real hardware". Maybe I should add this as a
> common disclaimer to all my reports to avoid misunderstandings.
>
> Thanks,
> Guenter
>