================================================================== BUG: KCSAN: data-race in fat_bmap / generic_write_end write to 0xffff888122a113c8 of 8 bytes by task 9012 on cpu 0: i_size_write include/linux/fs.h:878 [inline] generic_write_end+0x98/0x230 fs/buffer.c:2183 fat_write_end+0x4a/0x150 fs/fat/inode.c:249 generic_perform_write+0x26a/0x3f0 mm/filemap.c:3798 __generic_file_write_iter+0x172/0x280 mm/filemap.c:3883 generic_file_write_iter+0x75/0x130 mm/filemap.c:3947 do_iter_readv_writev+0x27b/0x300 do_iter_write+0x16f/0x5c0 fs/read_write.c:852 vfs_iter_write+0x4c/0x70 fs/read_write.c:893 iter_file_splice_write+0x44a/0x7c0 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x80/0xa0 fs/splice.c:936 splice_direct_to_actor+0x345/0x660 fs/splice.c:891 do_splice_direct+0xfb/0x180 fs/splice.c:979 do_sendfile+0x3ad/0x900 fs/read_write.c:1246 __do_sys_sendfile64 fs/read_write.c:1311 [inline] __se_sys_sendfile64 fs/read_write.c:1297 [inline] __x64_sys_sendfile64+0x10c/0x150 fs/read_write.c:1297 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff888122a113c8 of 8 bytes by task 9025 on cpu 1: i_size_read include/linux/fs.h:856 [inline] is_exceed_eof fs/fat/cache.c:340 [inline] fat_bmap+0x1cc/0x290 fs/fat/cache.c:375 __fat_get_block fs/fat/inode.c:129 [inline] fat_get_block+0xcf/0x600 fs/fat/inode.c:190 do_mpage_readpage+0x3e8/0xf20 fs/mpage.c:203 mpage_readahead+0x18b/0x3f0 fs/mpage.c:356 fat_readahead+0x18/0x20 fs/fat/inode.c:215 read_pages+0xa0/0x7c0 mm/readahead.c:157 page_cache_ra_unbounded+0x11f/0x2e0 mm/readahead.c:234 do_page_cache_ra mm/readahead.c:291 [inline] page_cache_ra_order mm/readahead.c:546 [inline] ondemand_readahead+0x5df/0x780 mm/readahead.c:668 page_cache_sync_ra+0x1a4/0x1b0 mm/readahead.c:695 page_cache_sync_readahead include/linux/pagemap.h:1185 [inline] filemap_get_pages mm/filemap.c:2592 [inline] filemap_read+0x3e5/0x1400 mm/filemap.c:2679 generic_file_read_iter+0x72/0x320 mm/filemap.c:2825 call_read_iter include/linux/fs.h:2044 [inline] generic_file_splice_read+0x1de/0x2c0 fs/splice.c:311 do_splice_to fs/splice.c:796 [inline] splice_direct_to_actor+0x2ac/0x660 fs/splice.c:870 do_splice_direct+0xfb/0x180 fs/splice.c:979 do_sendfile+0x3ad/0x900 fs/read_write.c:1246 __do_sys_sendfile64 fs/read_write.c:1311 [inline] __se_sys_sendfile64 fs/read_write.c:1297 [inline] __x64_sys_sendfile64+0x10c/0x150 fs/read_write.c:1297 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x000000000011d000 -> 0x000000000011e000 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 9025 Comm: syz-executor.3 Not tainted 5.18.0-rc7-syzkaller-00119-gb015dcd62b86-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================