On Thu, Aug 01, 2024 at 10:27:39AM +0800, Lizhi Xu wrote: > syzbot report KMSAN: uninit-value in pick_link, this is because the > corresponding folio was not found from the mapping, and the memory was > not initialized when allocating a new folio for the filemap. > > To avoid the occurrence of kmsan report uninit-value, initialize the > newly allocated folio memory to 0. NAK. You are papering over the real bug here. That page either * has been returned by find_get_page(), cached, uptodate and with uninitialized contents or * has been returned by successful read_mapping_page() - and left with uninitialized contents or * had inode->i_size in excess of initialized contents. I'd suggest bisecting that.
