Lockdep warnings on kexec (virtio_blk, hrtimers)

[David Woodhouse]

On Fri, 2024-12-13 at 11:42 +0100, Thomas Gleixner wrote:
> 
> That's the control thread on CPU0. The hotplug thread on CPU1 is stuck
> here:
> 
>  task:cpuhp/1         state:D stack:0     pid:24    tgid:24    ppid:2      flags:0x00004000
>  Call Trace:
>   <TASK>
>   __schedule+0x51f/0x1a80
>   schedule+0x3a/0x140
>   schedule_timeout+0x90/0x110
>   msleep+0x2b/0x40
>   blk_mq_hctx_notify_offline+0x160/0x3a0
>   cpuhp_invoke_callback+0x2a8/0x6c0
>   cpuhp_thread_fun+0x1ed/0x270
>   smpboot_thread_fn+0xda/0x1d0
> 
> So something with those blk_mq fixes went sideways.

 $ git bisect bad
7678abee0867e6b7fb89aa40f6e9f575f755fb37 is the first bad commit
commit 7678abee0867e6b7fb89aa40f6e9f575f755fb37 (HEAD)
Author: Ming Lei <ming.lei at redhat.com>
Date:   Tue Nov 12 20:58:21 2024 +0800

    virtio-blk: don't keep queue frozen during system suspend

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