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Bug#1033398: linux-image-amd64: reproducible kernel freeze on 5.19+

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Hi all,

the fix was merged upstream with 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/mm/maccess.c?id=d319f344561de23e810515d109c7278919bff7b0

- florian

On 3/25/23 16:58, Diederik de Haas wrote:
> Control: found -1 5.19~rc4-1~exp1
> Control: forwarded -1 https://lore.kernel.org/bpf/20230118051443.78988-1-alexei.starovoitov@gmail.com/
> 
> On Saturday, 25 March 2023 16:00:47 CET Florian Lehner wrote:
>>> Via https://snapshot.debian.org/binary/linux-image-amd64/ you can easily
>>> test various kernel versions. Could you try whether 5.19~rc4-1~exp1
>>> indeed produces the problem?
>>
>> Yes - I can reproduce the total system freeze with 5.19~rc4-1~exp1
> 
> Thanks. Then the most likely case was that it was introduced in
> the 5.19 merge window and thus also present in 5.19-rc1, but there isn't a
> prebuild kernel to verify.
> 
>>>> Since the running program is rather complex, it is not easily possible
>>>> to carve out a small reproducer. We can provide gdb backtraces from
>>>> freezes inside qemu.
>>>
>>> Someone else would have to chime in for the backtraces; that's beyond my
>>> skill set.
>>
>> I just learned about
>> https://lore.kernel.org/bpf/20230118051443.78988-1-alexei.starovoitov@gmail.
>> com/. With the provided patch applied I no longer mange to freeze the
>> system.
> 
> I see you already responded to that thread, excellent :-)
> Hopefully they'll read this whole bug report, but mentioning that your actual
> problem was NOT triggered till 5.18, but did trigger from 5.19-rc4 and later,
> could be useful. I may not fully understand what upstream talked about, but I
> only saw a reference to a 6.0.0 kernel.
> 
> Thanks for testing and reporting back :-)

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Thread

Bug#1033398: linux-image-amd64: reproducible kernel freeze on 5.19+ Florian Lehner <dev@der-flo.net> - 2023-03-25 16:10 +0100
  Bug#1033398: linux-image-amd64: reproducible kernel freeze on 5.19+ Diederik de Haas <didi.debian@cknow.org> - 2023-03-25 17:10 +0100
    Bug#1033398: linux-image-amd64: reproducible kernel freeze on 5.19+ Florian Lehner <dev@der-flo.net> - 2023-06-05 21:10 +0200
      Bug#1033398: linux-image-amd64: reproducible kernel freeze on 5.19+ Salvatore Bonaccorso <carnil@debian.org> - 2023-06-07 21:40 +0200

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