================================================================== BUG: KCSAN: data-race in do_mpage_readpage / set_blocksize write to 0xffff88812528b926 of 1 bytes by task 12196 on cpu 1: set_blocksize+0x17f/0x1c0 fs/block_dev.c:135 sb_set_blocksize+0x3d/0xc0 fs/block_dev.c:145 sb_min_blocksize+0x95/0xb0 fs/block_dev.c:161 fat_fill_super+0x1c8/0x1da0 fs/fat/inode.c:1647 vfat_fill_super+0x37/0x50 fs/fat/namei_vfat.c:1050 mount_bdev+0x264/0x2d0 fs/super.c:1417 vfat_mount+0x38/0x50 fs/fat/namei_vfat.c:1057 legacy_get_tree+0x78/0xf0 fs/fs_context.c:622 vfs_get_tree+0x52/0x190 fs/super.c:1547 do_new_mount fs/namespace.c:2822 [inline] do_mount+0xff0/0x14d0 fs/namespace.c:3107 __do_sys_mount fs/namespace.c:3316 [inline] __se_sys_mount fs/namespace.c:3293 [inline] __x64_sys_mount+0x12b/0x1a0 fs/namespace.c:3293 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88812528b926 of 1 bytes by task 12198 on cpu 0: do_mpage_readpage+0x7c/0xf70 fs/mpage.c:160 mpage_readpages+0x282/0x370 fs/mpage.c:404 blkdev_readpages+0x32/0x50 fs/block_dev.c:620 read_pages+0xa2/0x2d0 mm/readahead.c:126 __do_page_cache_readahead+0x358/0x380 mm/readahead.c:212 force_page_cache_readahead+0x12c/0x1e0 mm/readahead.c:243 page_cache_sync_readahead+0x1d1/0x1e0 mm/readahead.c:522 generic_file_buffered_read mm/filemap.c:2029 [inline] generic_file_read_iter+0xeae/0x1490 mm/filemap.c:2302 blkdev_read_iter+0xae/0xe0 fs/block_dev.c:2039 call_read_iter include/linux/fs.h:1895 [inline] new_sync_read+0x306/0x450 fs/read_write.c:414 __vfs_read+0x9e/0xb0 fs/read_write.c:427 vfs_read fs/read_write.c:461 [inline] vfs_read+0x13e/0x2b0 fs/read_write.c:446 ksys_read+0xc5/0x1a0 fs/read_write.c:587 __do_sys_read fs/read_write.c:597 [inline] __se_sys_read fs/read_write.c:595 [inline] __x64_sys_read+0x49/0x60 fs/read_write.c:595 do_syscall_64+0xc7/0x390 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 12198 Comm: blkid Not tainted 5.6.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================