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Date: Fri, 18 Feb 2022 01:03:13 -0500 From: "Theodore Ts'o" <tytso@....edu> To: Matthew Wilcox <willy@...radead.org> Cc: Lee Jones <lee.jones@...aro.org>, linux-ext4@...r.kernel.org, Christoph Hellwig <hch@....de>, Dave Chinner <dchinner@...hat.com>, Goldwyn Rodrigues <rgoldwyn@...e.com>, "Darrick J . Wong" <darrick.wong@...cle.com>, Bob Peterson <rpeterso@...hat.com>, Damien Le Moal <damien.lemoal@....com>, Andreas Gruenbacher <agruenba@...hat.com>, Ritesh Harjani <riteshh@...ux.ibm.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Johannes Thumshirn <jth@...nel.org>, linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org, cluster-devel@...hat.com, linux-kernel@...r.kernel.org Subject: Re: [REPORT] kernel BUG at fs/ext4/inode.c:2620 - page_buffers() On Fri, Feb 18, 2022 at 04:24:20AM +0000, Matthew Wilcox wrote: > On Thu, Feb 17, 2022 at 09:54:30PM -0500, Theodore Ts'o wrote: > > process_vm_writev() uses [un]pin_user_pages_remote() which is the same > > interface uses for RDMA. But it's not clear this is ever supposed to > > work for memory which is mmap'ed region backed by a file. > > pin_user_pages_remote() appears to assume that it is an anonymous > > region, since the get_user_pages functions in mm/gup.c don't call > > read_page() to read data into any pages that might not be mmaped in. > > ... it doesn't end up calling handle_mm_fault() in faultin_page()? Ah yes, sorry, I missed that. This is what happens when a syzbot bug is thrown to a file system developer, who then has to wade theough mm code for which he is not understand.... - Ted
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