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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 09:56:28 +0100	[thread overview]
Message-ID: <e846cb5f-65c4-4a9b-9f9b-593e4af526d8@kernel.org> (raw)
In-Reply-To: <87eclsrtqg.ffs@tglx>

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.

thanks,
-- 
js
suse labs

  parent reply	other threads:[~2026-03-10  8:56 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 [this message]
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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