Re: INFO: rcu detected stall in dummy_timer (3)

[Alan Stern]

On Thu, Apr 23, 2026 at 09:05:38AM -0700, syzbot wrote:
> > I'm revisiting an old syzbot bug caused by a tight resubmit loop, this 
> > one in mceusb.  The bug was fixed by commit 476db72e5219 ("media: 
> > mceusb: return without resubmitting URB in case of -EPROTO error."), but 
> > I want to try fixing it a different way, by changing dummy-hcd.
> >
> > This is a preliminary test, to make sure the bug can still be triggered.  
> > The patch below doesn't do anything -- yet!
> >
> > Alan Stern
> >
> > #syz test: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git 811d22141369
> 
> This bug is already marked as fixed. No point in testing.

All right.  I'm going to do something rather heavy-handed to convince 
syzbot to run the test.  I'll try to remember to undo this action after 
the testing is all finished.

Alan Stern

#syz unfix