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Date: Wed, 29 Nov 2023 11:32:33 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Zhengyuan Liu <liuzhengyuang521@gmail.com>
Cc: mingo@redhat.com, linux-perf-users@vger.kernel.org,
	stable@vger.kernel.org, =?utf-8?B?6IOh5rW3?= <huhai@kylinos.cn>,
	=?utf-8?B?5YiY5LqR?= <liuyun01@kylinos.cn>, huangjinhui@kylinos.cn,
	Zhengyuan Liu <liuzhengyuan@kylinos.cn>, acme@kernel.org
Subject: Re: Question about perf sibling_list race problem
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References: <CAOOPZo5oFZAs3sMcEgmTEZy3ef4jg630xL3mUBx3bvV6tQcdQg@mail.gmail.com>
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On Wed, Nov 29, 2023 at 05:33:33PM +0800, Zhengyuan Liu wrote:
> Hi, all
> 
> We are encountering a perf related soft lockup as shown below:
> 
> [25023823.265138] watchdog: BUG: soft lockup - CPU#29 stuck for 45s!
> [YD:3284696]
> [25023823.275772]  net_failover virtio_scsi failover
> [25023823.276750] CPU: 29 PID: 3284696 Comm: YD Kdump: loaded Not
> tainted 4.19.90-23.18.v2101.ky10.aarch64 #1
          ^^^^^^^^^^^^^^^^^^^

That is some unholy ancient kernel. Please see if you can reproduce on
something recent.