On Fri, Jan 31, 2020 at 08:06:52AM +0300, Dan Carpenter wrote: > We changed this from dev_err() to dev_WARN() in commit 0cb54a3e47cb > ("USB: debugging code shouldn't alter control flow"). > > The difference between dev_WARN() and dev_err() is that dev_WARN() > prints a stack trace and if you have panic on OOPS enabled then it leads > to a panic. The dev_err() function just prints the error message. > > Back in the day we didn't have usb emulators fuzz testing the kernel > so dev_WARN() didn't cause a problem for anyone, but these days the > dev_WARN() interferes with syzbot so let's change this to a dev_err(). > > Reported-by: syzbot+1bc2c2afd44f820a669f@xxxxxxxxxxxxxxxxxxxxxxxxx > Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> > --- > > drivers/usb/core/urb.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c > index da923ec17612..0980c1d2253d 100644 > --- a/drivers/usb/core/urb.c > +++ b/drivers/usb/core/urb.c > @@ -475,7 +475,7 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags) > > /* Check that the pipe's type matches the endpoint's type */ > if (usb_urb_ep_type_check(urb)) > - dev_WARN(&dev->dev, "BOGUS urb xfer, pipe %x != type %x\n", > + dev_err(&dev->dev, "BOGUS urb xfer, pipe %x != type %x\n", > usb_pipetype(urb->pipe), pipetypes[xfertype]); Like others said, we should have the stack trace here. So can you change this to dev_warn() and a stacktrace? thanks, greg k-h