[Kernel Bug] INFO: task hung in cgroup_drain_dying

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Longxing Li

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7:42 AM (15 hours ago) 7:42 AM

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Dear Linux kernel developers and maintainers,

We would like to report a new kernel bug found by our tool. INFO: task
hung in cgroup_drain_dying. Details are as follows.

Kernel commit: v7.0.6
Kernel config: see attachment
report: see attachment

We are currently analyzing the root cause and working on a
reproducible PoC. We will provide further updates in this thread as
soon as we have more information.

Best regards,
Longxing Li

==================================================================
https://drive.google.com/file/d/1riFUIPWojkYVZu0B5BW8uVPocUWwibqN/view?usp=drive_link

Michal Koutný

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8:58 AM (14 hours ago) 8:58 AM

to Longxing Li, syzk...@googlegroups.com, t...@kernel.org, han...@cmpxchg.org, cgr...@vger.kernel.org, linux-...@vger.kernel.org

Hello Longxing.

On Tue, Jun 09, 2026 at 07:42:06PM +0800, Longxing Li <coreg...@gmail.com> wrote:
> We would like to report a new kernel bug found by our tool. INFO: task
> hung in cgroup_drain_dying. Details are as follows.

Thanks but I see no attachment.

(Greater if you could add description as plaintext [1])

> Kernel commit: v7.0.6
> Kernel config: see attachment

Do you have lockdep enabled (CONFIG_PROVE_LOCKING)? That may help
debugging here.

Thanks,
Michal

[1] https://docs.kernel.org/process/email-clients.html#general-preferences