loop2: detected capacity change from 0 to 87 ================================================================== BUG: KCSAN: data-race in __add_to_page_cache_locked / filemap_write_and_wait_range write to 0xffff8881004115e8 of 8 bytes by task 20578 on cpu 1: __add_to_page_cache_locked+0x276/0x4f0 mm/filemap.c:931 add_to_page_cache_lru+0xa0/0x1b0 mm/filemap.c:984 page_cache_ra_unbounded+0x274/0x430 mm/readahead.c:222 do_page_cache_ra mm/readahead.c:269 [inline] force_page_cache_ra+0x256/0x290 mm/readahead.c:301 page_cache_sync_ra+0xcc/0xe0 mm/readahead.c:575 page_cache_sync_readahead include/linux/pagemap.h:883 [inline] filemap_get_pages mm/filemap.c:2545 [inline] filemap_read+0x3ad/0x1220 mm/filemap.c:2628 generic_file_read_iter+0x75/0x2c0 mm/filemap.c:2779 blkdev_read_iter+0xb9/0xf0 block/fops.c:545 call_read_iter include/linux/fs.h:2157 [inline] new_sync_read fs/read_write.c:404 [inline] vfs_read+0x66c/0x750 fs/read_write.c:485 ksys_read+0xd9/0x190 fs/read_write.c:623 __do_sys_read fs/read_write.c:633 [inline] __se_sys_read fs/read_write.c:631 [inline] __x64_sys_read+0x3e/0x50 fs/read_write.c:631 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff8881004115e8 of 8 bytes by task 21475 on cpu 0: mapping_needs_writeback mm/filemap.c:639 [inline] filemap_write_and_wait_range+0x36/0x3c0 mm/filemap.c:703 filemap_write_and_wait include/linux/fs.h:2865 [inline] __sync_blockdev block/bdev.c:193 [inline] sync_blockdev block/bdev.c:202 [inline] set_blocksize+0x1c4/0x270 block/bdev.c:155 sb_set_blocksize+0x2c/0xa0 block/bdev.c:166 fat_fill_super+0x135e/0x2b10 fs/fat/inode.c:1681 msdos_fill_super+0x29/0x30 fs/fat/namei_msdos.c:655 mount_bdev+0x1e8/0x290 fs/super.c:1368 msdos_mount+0x2d/0x40 fs/fat/namei_msdos.c:662 legacy_get_tree+0x70/0xc0 fs/fs_context.c:610 vfs_get_tree+0x4a/0x1a0 fs/super.c:1498 do_new_mount fs/namespace.c:2988 [inline] path_mount+0x11ec/0x1d20 fs/namespace.c:3318 do_mount fs/namespace.c:3331 [inline] __do_sys_mount fs/namespace.c:3539 [inline] __se_sys_mount+0x24b/0x2f0 fs/namespace.c:3516 __x64_sys_mount+0x63/0x70 fs/namespace.c:3516 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae value changed: 0x0000000000000001 -> 0x0000000000000002 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 21475 Comm: syz-executor.2 Not tainted 5.15.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== FAT-fs (loop2): Directory bread(block 431) failed FAT-fs (loop2): Directory bread(block 432) failed FAT-fs (loop2): Directory bread(block 433) failed FAT-fs (loop2): Directory bread(block 434) failed FAT-fs (loop2): Directory bread(block 435) failed FAT-fs (loop2): Directory bread(block 436) failed FAT-fs (loop2): Directory bread(block 437) failed FAT-fs (loop2): Directory bread(block 438) failed FAT-fs (loop2): Directory bread(block 439) failed FAT-fs (loop2): Directory bread(block 440) failed