From: Jiri Slaby <jirislaby@kernel.org>
To: Thomas Gleixner <tglx@kernel.org>, Matthieu Baerts <matttbe@kernel.org>
Cc: "Peter Zijlstra" <peterz@infradead.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: Tue, 10 Mar 2026 10:00:01 +0100 [thread overview]
Message-ID: <76e2b909-98db-49de-a8eb-f6f0a192f630@kernel.org> (raw)
In-Reply-To: <e846cb5f-65c4-4a9b-9f9b-593e4af526d8@kernel.org>
On 10. 03. 26, 9:56, Jiri Slaby wrote:
> Thomas,
>
> On 10. 03. 26, 9:09, Thomas Gleixner wrote:
>> 2) task is not longer in the task list w/o going through do_exit()
>
> After a quick look (I have to run now, so I could be completely wrong):
> what about the task is not in the list *yet*. You use RCU ->
> for_each_process_thread(), so there could be a race with attach_pid()
> protected by tasklist_lock.
Not attach_pid(), that's irrelevant here.
But one line below in copy_process(): list_add_tail().
> thanks,
--
js
suse labs
next prev parent reply other threads:[~2026-03-10 9:00 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
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 [this message]
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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