From: Thomas Gleixner <tglx@kernel.org>
To: Matthieu Baerts <matttbe@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: Tue, 10 Mar 2026 09:20:38 +0100 [thread overview]
Message-ID: <87bjgwrt7t.ffs@tglx> (raw)
In-Reply-To: <87eclsrtqg.ffs@tglx>
On Tue, Mar 10 2026 at 09:09, Thomas Gleixner wrote:
> On Mon, Mar 09 2026 at 13:23, Matthieu Baerts wrote:
> So the only circumstances where mm_cid_do_fixup_tasks_to_cpus() fails to
> do that are:
>
> 1) task->mm != mm.
>
> or
>
> 2) task is not longer in the task list w/o going through do_exit()
or
3) task->mm_cid.active == 0 again w/o going through do_exit()
> How the heck is either one of them possible?
>
> Just for the record. The picture Jiri decoded from the VM crash dump is
> exactly the same. One task is not listed.
>
> Confused
>
> tglx
next prev parent reply other threads:[~2026-03-10 8:20 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 [this message]
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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