================================================================== BUG: KCSAN: data-race in __add_to_page_cache_locked / filemap_write_and_wait_range write to 0xffff8881010775e8 of 8 bytes by task 18321 on cpu 0: __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 0xffff8881010775e8 of 8 bytes by task 1874 on cpu 1: 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 ext4_fill_super+0x2287/0x7830 fs/ext4/super.c:4327 mount_bdev+0x1e8/0x290 fs/super.c:1368 ext4_mount+0x2d/0x40 fs/ext4/super.c:6515 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: 0x0000000000000009 -> 0x000000000000000a Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 1874 Comm: syz-executor.1 Not tainted 5.15.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ================================================================== EXT4-fs error (device loop1): ext4_fill_super:4816: inode #2: comm syz-executor.1: iget: root inode unallocated EXT4-fs (loop1): get root inode failed EXT4-fs (loop1): mount failed