On Tue, 15 Mar 2022 16:27:38 +0100, Greg KH wrote: > Your change just crashed the kernel :( > > Please be more careful I am sorry. I ever been told that vfree(NULL) or kfree(NULL) is safe, so I just jump to the tag `err_free` in this version. I will resend one by adding a new proper tag. And in fact, I did not find where ->bulk_scratch is used. Regards, Xiaoke Wang