linux-kernel - Re: [syzbot] [kvm?] [net?] [virt?] INFO: task hung in __vhost_worker

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Message-ID: <20240816141505-mutt-send-email-mst@kernel.org>
Date: Fri, 16 Aug 2024 14:17:30 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: Sean Christopherson <seanjc@...gle.com>
Cc: syzbot <syzbot+7f3bbe59e8dd2328a990@...kaller.appspotmail.com>,
	eperezma@...hat.com, jasowang@...hat.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	syzkaller-bugs@...glegroups.com, virtualization@...ts.linux.dev,
	Mike Christie <michael.christie@...cle.com>, oleg@...hat.com,
	ebiederm@...ssion.com, sgarzare@...hat.com, stefanha@...hat.com,
	brauner@...nel.org
Subject: Re: [syzbot] [kvm?] [net?] [virt?] INFO: task hung in
 __vhost_worker_flush

On Fri, Aug 16, 2024 at 11:10:32AM -0700, Sean Christopherson wrote:
> On Fri, Aug 16, 2024, syzbot wrote:
> > > On Wed, May 29, 2024, syzbot wrote:
> > >> Hello,
> > >> 
> > >> syzbot found the following issue on:
> > >> 
> > >> HEAD commit:    9b62e02e6336 Merge tag 'mm-hotfixes-stable-2024-05-25-09-1..
> > >> git tree:       upstream
> > >> console output: https://syzkaller.appspot.com/x/log.txt?x=16cb0eec980000
> > >> kernel config:  https://syzkaller.appspot.com/x/.config?x=3e73beba72b96506
> > >> dashboard link: https://syzkaller.appspot.com/bug?extid=7f3bbe59e8dd2328a990
> > >> compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
> > >> 
> > >> Unfortunately, I don't have any reproducer for this issue yet.
> > >> 
> > >> Downloadable assets:
> > >> disk image: https://storage.googleapis.com/syzbot-assets/61b507f6e56c/disk-9b62e02e.raw.xz
> > >> vmlinux: https://storage.googleapis.com/syzbot-assets/6991f1313243/vmlinux-9b62e02e.xz
> > >> kernel image: https://storage.googleapis.com/syzbot-assets/65f88b96d046/bzImage-9b62e02e.xz
> > >> 
> > >> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > >> Reported-by: syzbot+7f3bbe59e8dd2328a990@...kaller.appspotmail.com
> > >
> > > #syz unset kvm
> > 
> > The following labels did not exist: kvm
> 
> Hrm, looks like there's no unset for a single subsytem, so:
> 
> #syz set subsystems: net,virt

Must be this patchset:

https://lore.kernel.org/all/20240316004707.45557-1-michael.christie@oracle.com/

but I don't see anything obvious there to trigger it, and it's not
reproducible yet...

-- 
MST