From: Matthew Wilcox <willy@infradead.org>
To: 王志 <23009200614@stu.xidian.edu.cn>
Cc: linux-kernel@vger.kernel.org, rcu@vger.kernel.org,
linux-mm@kvack.org, dri-devel@lists.freedesktop.org,
x86@kernel.org, paulmck@kernel.org, tglx@linutronix.de,
peterz@infradead.org, akpm@linux-foundation.org,
syzkaller-bugs@googlegroups.com
Subject: Re: [BUG] rcu: stall detected in sys_mmap with PREEMPT(full) involving timer softirq and DRM vblank disable
Date: Wed, 7 Jan 2026 14:49:39 +0000 [thread overview]
Message-ID: <aV5ygyPM7J7VdmgL@casper.infradead.org> (raw)
In-Reply-To: <6b7e2fac.a60e.19b97034116.Coremail.23009200614@stu.xidian.edu.cn>
On Wed, Jan 07, 2026 at 01:52:11PM +0800, 王志 wrote:
> Hello,
>
> I am reporting an RCU stall detected during syzkaller-style fuzz testing.
> The stall is reported while executing sys_mmap(), with the
> rcu_preempt grace-period kthread starved for over 10 seconds. The
> observed stacks involve memory fault handling, timer softirq processing,
> and DRM vblank disable paths. With PREEMPT(full) enabled, the RCU grace
> period fails to complete.
Get your changes into syzkaller upstream, don't spam us with "i'm doing
syzbot's job".
prev parent reply other threads:[~2026-01-07 14:49 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-07 5:52 王志
2026-01-07 14:49 ` Matthew Wilcox [this message]
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=aV5ygyPM7J7VdmgL@casper.infradead.org \
--to=willy@infradead.org \
--cc=23009200614@stu.xidian.edu.cn \
--cc=akpm@linux-foundation.org \
--cc=dri-devel@lists.freedesktop.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=paulmck@kernel.org \
--cc=peterz@infradead.org \
--cc=rcu@vger.kernel.org \
--cc=syzkaller-bugs@googlegroups.com \
--cc=tglx@linutronix.de \
--cc=x86@kernel.org \
/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