linux-kernel - Re: [syzbot] [mm?] KCSAN: data-race in mprotect_fixup / try_to_migrate

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Message-ID: <74308437-2684-46d3-a2c1-c55ed4dde042@lucifer.local>
Date: Wed, 5 Feb 2025 15:34:45 +0000
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Jann Horn <jannh@...gle.com>
Cc: syzkaller <syzkaller@...glegroups.com>,
        syzbot <syzbot+c2e5712cbb14c95d4847@...kaller.appspotmail.com>,
        Liam.Howlett@...cle.com, akpm@...ux-foundation.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        syzkaller-bugs@...glegroups.com, vbabka@...e.cz
Subject: Re: [syzbot] [mm?] KCSAN: data-race in mprotect_fixup /
 try_to_migrate_one

On Wed, Feb 05, 2025 at 04:14:03PM +0100, Jann Horn wrote:
> On Wed, Feb 5, 2025 at 4:07 PM Lorenzo Stoakes
> <lorenzo.stoakes@...cle.com> wrote:
> > On Wed, Feb 05, 2025 at 03:41:20AM -0800, syzbot wrote:
> > > read to 0xffff888114b41700 of 8 bytes by task 6418 on cpu 0:
> > >  try_to_migrate_one+0xb5a/0x12e0 mm/rmap.c:2321
> >
> > Be super nice if these reports could show the line of code!
> >
> > It's:
> >
> >                 if (vma->vm_flags & VM_LOCKED)
>
> fwiw if you follow the "dashboard link" in the bug report, you'll get
> a version of this where the source locations are clickable links to
> git.kernel.org at the right commit.
>
> Also note the "syzbot engineers can be reached at
> syzkaller@...glegroups.com" at the bottom of the message.

But but but... I like shouting into the void! :P

Anyway I see that they're cc'd and sometimes reply, this was more a
meandering thought if somebody happened to notice rather than urgent. A
'nice to have' if you will...