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

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Message-ID: <20240407005056.GF538574@ZenIV>
Date: Sun, 7 Apr 2024 01:50:56 +0100
From: Al Viro <viro@...iv.linux.org.uk>
To: Amir Goldstein <amir73il@...il.com>
Cc: syzbot <syzbot+9a5b0ced8b1bfb238b56@...kaller.appspotmail.com>,
	brauner@...nel.org, gregkh@...uxfoundation.org, hch@....de,
	jack@...e.cz, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, miklos@...redi.hu,
	syzkaller-bugs@...glegroups.com, tj@...nel.org,
	valesini@...dex-team.ru, Hillf Danton <hdanton@...a.com>
Subject: Re: [syzbot] [kernfs?] possible deadlock in kernfs_fop_llseek

On Sat, Apr 06, 2024 at 11:57:11AM +0300, Amir Goldstein wrote:
> On Sat, Apr 6, 2024 at 10:11 AM Al Viro <viro@...iv.linux.org.uk> wrote:
> >
> > On Sat, Apr 06, 2024 at 12:05:04AM -0700, syzbot wrote:
> >
> > > commit:         3398bf34 kernfs: annotate different lockdep class for ..
> > > git tree:       https://github.com/amir73il/linux/ vfs-fixes
> > > kernel config:  https://syzkaller.appspot.com/x/.config?x=c5cda112a8438056
> > > dashboard link: https://syzkaller.appspot.com/bug?extid=9a5b0ced8b1bfb238b56
> > > compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
> > >
> > > Note: no patches were applied.
> >
> 
> Looks like it fixes the problem:
> https://lore.kernel.org/lkml/000000000000a386f2061562ba6a@google.com/
> 
> Al,
> 
> Are you ok with going with your solution?
> Do you want to pick it up through your tree?
> Or shall I post it and ask Christian or Greg to pick it up?

Umm...  I can grab it into #fixes.  Would be nice to get the result of
that test both on current mainline and mainline + patch, though - looks
like the same test keeps hitting some unrelated shite in virtio_scsi.