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Subject[PATCH] usb: core: urb: change a dev_WARN() to dev_err() for syzbot
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().

Signed-off-by: Dan Carpenter <>

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]);

/* Check against a simple/standard policy */
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