From: Thomas Gleixner <tglx@linutronix.de>
To: Hillf Danton <hdanton@sina.com>
Cc: syzbot <syzbot+6fb78d577e89e69602f9@syzkaller.appspotmail.com>,
linux-kernel@vger.kernel.org, pbonzini@redhat.com,
syzkaller-bugs@googlegroups.com,
Steven Rostedt <rosted@goodmis.org>,
Marcel Holtmann <marcel@holtmann.org>,
Luiz Augusto von Dentz <luiz.dentz@gmail.com>
Subject: Re: [syzbot] WARNING in call_timer_fn
Date: Thu, 17 Nov 2022 17:06:48 +0100 [thread overview]
Message-ID: <87wn7tlg4n.ffs@tglx> (raw)
In-Reply-To: <20221117125523.3783-1-hdanton@sina.com>
On Thu, Nov 17 2022 at 20:55, Hillf Danton wrote:
> On 17 Nov 2022 12:54:28 +0100 Thomas Gleixner <tglx@linutronix.de>
>>
>> The work has been canceled already before in the same function and there
>> are some more delayed works which can trigger this.
>>
>> So no, this whole close_sync() function is prone to teardown races and
>> just slapping a single cancel here without deeper analysis does not cut
>> it.
>
> Agree.
>
> A set of sync cancelations can do the job, given what is defined in struct
> hci_dev wrt workqueue.
It's only part of the solution because you also have to prevent that
work is queued from other parts of the code....
next prev parent reply other threads:[~2022-11-17 16:07 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-16 15:25 [syzbot] WARNING in call_timer_fn syzbot
2022-11-16 18:29 ` Thomas Gleixner
[not found] ` <20221117024511.3606-1-hdanton@sina.com>
2022-11-17 11:54 ` Thomas Gleixner
[not found] ` <20221117125523.3783-1-hdanton@sina.com>
2022-11-17 16:06 ` Thomas Gleixner [this message]
2022-11-17 21:04 ` Luiz Augusto von Dentz
2022-11-17 21:16 ` Luiz Augusto von Dentz
2022-11-18 0:53 ` Tetsuo Handa
2022-11-18 1:17 ` Thomas Gleixner
[not found] ` <20221118012805.3862-1-hdanton@sina.com>
2022-11-18 20:01 ` Luiz Augusto von Dentz
2024-11-12 3:46 ` [syzbot] [bluetooth] " syzbot
[not found] <20221117010835.3474-1-hdanton@sina.com>
2022-11-17 1:35 ` [syzbot] " syzbot
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87wn7tlg4n.ffs@tglx \
--to=tglx@linutronix.de \
--cc=hdanton@sina.com \
--cc=linux-kernel@vger.kernel.org \
--cc=luiz.dentz@gmail.com \
--cc=marcel@holtmann.org \
--cc=pbonzini@redhat.com \
--cc=rosted@goodmis.org \
--cc=syzbot+6fb78d577e89e69602f9@syzkaller.appspotmail.com \
--cc=syzkaller-bugs@googlegroups.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox