From: Matthieu Baerts <matttbe@kernel.org>
To: Thomas Gleixner <tglx@kernel.org>
Cc: "Peter Zijlstra" <peterz@infradead.org>,
"Jiri Slaby" <jirislaby@kernel.org>,
"Stefan Hajnoczi" <stefanha@redhat.com>,
"Stefano Garzarella" <sgarzare@redhat.com>,
kvm@vger.kernel.org, virtualization@lists.linux.dev,
Netdev <netdev@vger.kernel.org>,
rcu@vger.kernel.org, "MPTCP Linux" <mptcp@lists.linux.dev>,
"Linux Kernel" <linux-kernel@vger.kernel.org>,
"Shinichiro Kawasaki" <shinichiro.kawasaki@wdc.com>,
"Paul E. McKenney" <paulmck@kernel.org>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
luto@kernel.org, "Michal Koutný" <MKoutny@suse.com>,
"Waiman Long" <longman@redhat.com>,
"Marco Elver" <elver@google.com>
Subject: Re: Stalls when starting a VSOCK listening socket: soft lockups, RCU stalls, timeout
Date: Sun, 8 Mar 2026 18:23:08 +0100 [thread overview]
Message-ID: <57c1e171-9520-4288-9e2d-10a72a499968@kernel.org> (raw)
In-Reply-To: <87v7f61cnl.ffs@tglx>
08 Mar 2026 17:58:26 Thomas Gleixner <tglx@kernel.org>:
> On Sun, Mar 08 2026 at 10:15, Thomas Gleixner wrote:
>
>> On Sat, Mar 07 2026 at 23:29, Thomas Gleixner wrote:
>>> I'll look at it more tomorrow in the hope that this rested brain
>>> approach works out again.
>>
>> There is another one of the same category. Combo patch below.
>
> This rested brain thing is clearly a myth. The patch actually solves
> nothing because the code ensures that the TRANSIT bit is never set
> together with the ONCPU bit.
Thank you for having shared these patches. I confirm the myth: I can
still reproduce the issue on my side.
> One of those moments where you just hope that the earth opens up and
> swallows you.
>
> So I'm back to square one. I go and do what I should have done in the
> first place. Write a debug patch with trace_printks and let the people
> who can actually trigger the problem run with it.
Happy to test such debug patches!
Cheers,
Matt
next prev parent reply other threads:[~2026-03-08 17:23 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-06 11:54 Stalls when starting a VSOCK listening socket: soft lockups, RCU stalls, timeout Matthieu Baerts
2026-02-06 16:38 ` Stefano Garzarella
2026-02-06 17:13 ` Matthieu Baerts
2026-02-26 10:37 ` Jiri Slaby
2026-03-02 5:28 ` Jiri Slaby
2026-03-02 11:46 ` Peter Zijlstra
2026-03-02 14:30 ` Waiman Long
2026-03-05 7:00 ` Jiri Slaby
2026-03-05 11:53 ` Jiri Slaby
2026-03-05 12:20 ` Jiri Slaby
2026-03-05 16:16 ` Thomas Gleixner
2026-03-05 17:33 ` Jiri Slaby
2026-03-05 19:25 ` Thomas Gleixner
2026-03-06 5:48 ` Jiri Slaby
2026-03-06 9:57 ` Thomas Gleixner
2026-03-06 10:16 ` Jiri Slaby
2026-03-06 16:28 ` Thomas Gleixner
2026-03-06 11:06 ` Matthieu Baerts
2026-03-06 16:57 ` Matthieu Baerts
2026-03-06 18:31 ` Jiri Slaby
2026-03-06 18:44 ` Matthieu Baerts
2026-03-06 21:40 ` Matthieu Baerts
2026-03-06 15:24 ` Peter Zijlstra
2026-03-07 9:01 ` Thomas Gleixner
2026-03-07 22:29 ` Thomas Gleixner
2026-03-08 9:15 ` Thomas Gleixner
2026-03-08 16:55 ` Jiri Slaby
2026-03-08 16:58 ` Thomas Gleixner
2026-03-08 17:23 ` Matthieu Baerts [this message]
2026-03-09 8:43 ` Thomas Gleixner
2026-03-09 12:23 ` Matthieu Baerts
2026-03-10 8:09 ` Thomas Gleixner
2026-03-10 8:20 ` Thomas Gleixner
2026-03-10 8:56 ` Jiri Slaby
2026-03-10 9:00 ` Jiri Slaby
2026-03-10 10:03 ` Thomas Gleixner
2026-03-10 10:06 ` Thomas Gleixner
2026-03-10 11:24 ` Matthieu Baerts
2026-03-10 11:54 ` Peter Zijlstra
2026-03-10 12:28 ` Thomas Gleixner
2026-03-10 13:40 ` Matthieu Baerts
2026-03-10 13:47 ` Thomas Gleixner
2026-03-10 15:51 ` Matthieu Baerts
2026-03-03 13:23 ` Matthieu Baerts
2026-03-05 6:46 ` Jiri Slaby
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