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CsdIBN4IS/uLns6AYVCfslqDUJEFatkjRw4MlAkHEduKumahZ8giC9oknZp7QPfUfYrSAiNZ/VIiLDqb1sWdUrG4aKWth2o2uAYsmpxdLFy2+jfenJ9vs1GNLfxsH1Ug7MbXLY4cVr0MQOEJuS9+Hejv4YapZum+XtK+EbxBL7s97tSbIfR/6LdB7q6Xj93H86tmw31ZjH/POZdBD1jpHw4jsGXmUq9pF+MRHLz9OFP8m0NmkMmCicLwipaVrTh+h8a7u1ITZO1fNDgVWXtW6xWr+siIwpU7k1ezK31xG7hNqc6PeofDh8wlhvLZIXSREiIG6FIfuH66qsqpx6RtY9t55W5aVGKPtFOrw X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2024-08-08 23:37, Greg Kroah-Hartman wrote: >> diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c >> index 8502ef68459b..72cc51dcf870 100644 >> --- a/fs/kernfs/file.c >> +++ b/fs/kernfs/file.c >> @@ -479,7 +479,7 @@ static int kernfs_fop_mmap(struct file *file, struct vm_area_struct *vma) >> * It is not possible to successfully wrap close. >> * So error if someone is trying to use close. >> */ >> - if (vma->vm_ops && vma->vm_ops->close) >> + if (WARN_ON_ONCE(vma->vm_ops && vma->vm_ops->close)) > > So you just rebooted a machine that hits this, loosing data everywhere. > Not nice :( Well, apologies for that, but there's no way to know what every single machine out there is doing... However if this machine is using ->close when that's clearly marked as unsupported then shouldn't we fix that?