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SubjectRe: [Syzkaller & bisect] There is "io_ring_exit_work" related Call Trace in v5.2-rc5 kernel
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On 2/2/23 1:56 AM, Pengfei Xu wrote:
> Hi Pavel Begunkov,
>
> On 2023-02-01 at 15:52:47 +0000, Pavel Begunkov wrote:
>> On 1/28/23 14:49, Pavel Begunkov wrote:
>>> On 1/28/23 08:44, Pengfei Xu wrote:
>>>> Hi Pavel Begunkov and kernel expert,
>>>>
>>>> Greeting!
>>>>
>>>> There is "io_ring_exit_work" related Call Trace in v5.2-rc5 kernel in guest
>>>> on Sapphire Rapids server.
>>>
>>> Thanks for the report, we'll take a look
>>
>> Not reproducible for me. Apparently, the repro creates a normal ring
>> and immediately closes it, then io_ring_exit_work() hangs waiting to
>> the task to execute task_work.
> Ah, I put the reproduced virtual machine in gitlab.
> git clone https://gitlab.com/xupengfe/repro_vm_env.git
> cd repro_vm_env
> tar -xvf repro_vm_env.tar.gz
> cd repro_vm_env; ./start3.sh // it needs qemu-system-x86_64 and I used v7.1.0
> //start3.sh will load bzImage_2241ab53cbb5cdb08a6b2d4688feb13971058f65 v6.2-rc5 kernel
> In vm and login with root, there is no password for root.
> After login vm successfully, ./repro to reproduce this issue.
> It could be reproduced in about 6min.
>
> If you already have qemu-system-x86_64, please ignore below info.
> If you want to install qemu v7.1.0 version,
> git clone https://github.com/qemu/qemu.git
> cd qemu
> git checkout -f v7.1.0
> mkdir build
> cd build
> yum install -y ninja-build.x86_64
> ../configure --target-list=x86_64-softmmu --enable-kvm --enable-vnc --enable-gtk --enable-sdl
> make
> make install
> Done.

Are you sure you attached the right kconfig in the initial report? It
is from 5.18.x.

--
Jens Axboe


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