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Re: VMs hanging with rcu stall problems
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From: |
Richard Purdie |
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Subject: |
Re: VMs hanging with rcu stall problems |
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Date: |
Tue, 29 Jun 2021 14:34:46 +0100 |
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User-agent: |
Evolution 3.40.0-1 |
On Thu, 2021-06-03 at 11:02 +0100, Richard Purdie wrote:
> We're seeing intermittent rcu stalls in qemu system mode emulation which is
> causing CI issues for us (Yocto Project). We're struggling to understand
> the cause and have tried several things to mitigate without much success.
> The stalls are odd in that the log messages look incomplete. An example
> from last night:
To answer my own question, the issue is a kernel bug in RCU stall handling.
The fix:
https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/commit/?h=rcu/next&id=c583bcb8f5ed
and patch which introduced the problem:
https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/commit/?h=rcu/next&id=c583bcb8f5ed
Cheers,
Richard