loop0: detected capacity change from 0 to 2048
==================================================================
BUG: KCSAN: data-race in __filemap_add_folio / filemap_write_and_wait_range

read-write to 0xffff888100630570 of 8 bytes by task 3250 on cpu 0:
 __filemap_add_folio+0x439/0x710 mm/filemap.c:918
 filemap_add_folio+0x9c/0x1b0 mm/filemap.c:970
 page_cache_ra_unbounded+0x148/0x2e0 mm/readahead.c:252
 do_page_cache_ra mm/readahead.c:303 [inline]
 force_page_cache_ra mm/readahead.c:332 [inline]
 page_cache_sync_ra+0x252/0x670 mm/readahead.c:530
 page_cache_sync_readahead include/linux/pagemap.h:1296 [inline]
 filemap_get_pages+0x252/0xfb0 mm/filemap.c:2529
 filemap_read+0x21c/0x690 mm/filemap.c:2625
 blkdev_read_iter+0x217/0x2c0 block/fops.c:764
 new_sync_read fs/read_write.c:395 [inline]
 vfs_read+0x5e9/0x6e0 fs/read_write.c:476
 ksys_read+0xeb/0x1b0 fs/read_write.c:619
 __do_sys_read fs/read_write.c:629 [inline]
 __se_sys_read fs/read_write.c:627 [inline]
 __x64_sys_read+0x42/0x50 fs/read_write.c:627
 x64_sys_call+0x27d3/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:1
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888100630570 of 8 bytes by task 6800 on cpu 1:
 mapping_needs_writeback mm/filemap.c:635 [inline]
 filemap_write_and_wait_range+0x58/0x1f0 mm/filemap.c:684
 filemap_write_and_wait include/linux/pagemap.h:66 [inline]
 sync_blockdev block/bdev.c:218 [inline]
 set_blocksize+0x1df/0x280 block/bdev.c:170
 sb_set_blocksize block/bdev.c:181 [inline]
 sb_min_blocksize+0x63/0xe0 block/bdev.c:197
 ext4_load_super fs/ext4/super.c:4991 [inline]
 __ext4_fill_super fs/ext4/super.c:5188 [inline]
 ext4_fill_super+0x38b/0x39e0 fs/ext4/super.c:5664
 get_tree_bdev+0x256/0x2e0 fs/super.c:1635
 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5696
 vfs_get_tree+0x56/0x1d0 fs/super.c:1800
 do_new_mount+0x227/0x690 fs/namespace.c:3472
 path_mount+0x49b/0xb30 fs/namespace.c:3799
 do_mount fs/namespace.c:3812 [inline]
 __do_sys_mount fs/namespace.c:4020 [inline]
 __se_sys_mount+0x27c/0x2d0 fs/namespace.c:3997
 __x64_sys_mount+0x67/0x80 fs/namespace.c:3997
 x64_sys_call+0x203e/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:166
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000000000003 -> 0x0000000000000004

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 6800 Comm: syz.0.712 Not tainted 6.11.0-rc1-syzkaller-00256-g1c4246294c98 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
==================================================================
EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.