linux-kernel - Re: [syzbot] [kernel?] possible deadlock in binder_alloc_free

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Message-ID: <CAJuCfpFK7Axp1J8xPSnjprPyeG8T70mq_XRKnBvDxvTaoUnnmw@mail.gmail.com>
Date: Wed, 19 Feb 2025 10:41:40 -0800
From: Suren Baghdasaryan <surenb@...gle.com>
To: Carlos Llamas <cmllamas@...gle.com>
Cc: syzbot <syzbot+799a2d4576c454ac2693@...kaller.appspotmail.com>, arve@...roid.com, 
	brauner@...nel.org, gregkh@...uxfoundation.org, joel@...lfernandes.org, 
	linux-kernel@...r.kernel.org, maco@...roid.com, 
	syzkaller-bugs@...glegroups.com, tkjos@...roid.com
Subject: Re: [syzbot] [kernel?] possible deadlock in binder_alloc_free_page

On Wed, Feb 19, 2025 at 10:35 AM Carlos Llamas <cmllamas@...gle.com> wrote:
>
> On Sat, Jan 11, 2025 at 02:30:22AM -0800, syzbot wrote:
> > Hello,
> >
> > syzbot found the following issue on:
> >
> > HEAD commit:    7b4b9bf203da Add linux-next specific files for 20250107
> > git tree:       linux-next
> > console output: https://syzkaller.appspot.com/x/log.txt?x=17d02dc4580000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=63fa2c9d5e12faef
> > dashboard link: https://syzkaller.appspot.com/bug?extid=799a2d4576c454ac2693
> > compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10302dc4580000
> >
> > Downloadable assets:
> > disk image: https://storage.googleapis.com/syzbot-assets/c179cc0c7a3c/disk-7b4b9bf2.raw.xz
> > vmlinux: https://storage.googleapis.com/syzbot-assets/fdea80f2ec16/vmlinux-7b4b9bf2.xz
> > kernel image: https://storage.googleapis.com/syzbot-assets/a277fcaff608/bzImage-7b4b9bf2.xz
> >
> > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > Reported-by: syzbot+799a2d4576c454ac2693@...kaller.appspotmail.com
>
> Hey Suren, just FYI. I bisected this to commit e8f32ff00a66 ("mm:
> replace vm_lock and detached flag with a reference count"), which was an
> older version (v7) of your patchset. However, I've tested the same on
> the newer linux-next tip with your v10 and it no longer reproduces the
> problem.

Thanks Carlos! There were a number of fixes since v7, including a
memory ordering fix. That issue might have caused this.

>
> Nothing else for me to do here.
>
> Regards,
> Carlos Llamas