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BUG: KCSAN: data-race in do_mpage_readpage / set_blocksize

write to 0xffff888100633c6e of 1 bytes by task 12413 on cpu 0:
 set_blocksize+0x218/0x270 block/bdev.c:171
 sb_set_blocksize block/bdev.c:181 [inline]
 sb_min_blocksize+0x63/0xe0 block/bdev.c:197
 ext4_load_super fs/ext4/super.c:5027 [inline]
 __ext4_fill_super fs/ext4/super.c:5248 [inline]
 ext4_fill_super+0x38b/0x3650 fs/ext4/super.c:5722
 get_tree_bdev_flags+0x29f/0x310 fs/super.c:1636
 get_tree_bdev+0x1f/0x30 fs/super.c:1659
 ext4_get_tree+0x1c/0x30 fs/ext4/super.c:5754
 vfs_get_tree+0x56/0x1e0 fs/super.c:1814
 do_new_mount+0x227/0x690 fs/namespace.c:3560
 path_mount+0x49b/0xb30 fs/namespace.c:3887
 do_mount fs/namespace.c:3900 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount+0x27f/0x2d0 fs/namespace.c:4088
 __x64_sys_mount+0x67/0x80 fs/namespace.c:4088
 x64_sys_call+0x2c84/0x2dc0 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

read to 0xffff888100633c6e of 1 bytes by task 3289 on cpu 1:
 do_mpage_readpage+0x55/0xcb0 fs/mpage.c:155
 mpage_readahead+0x1ad/0x2d0 fs/mpage.c:374
 blkdev_readahead+0x1c/0x30 block/fops.c:472
 read_pages+0x9e/0x460 mm/readahead.c:161
 page_cache_ra_unbounded+0x30d/0x350 mm/readahead.c:298
 do_page_cache_ra mm/readahead.c:328 [inline]
 force_page_cache_ra mm/readahead.c:357 [inline]
 page_cache_sync_ra+0x252/0x680 mm/readahead.c:585
 filemap_get_pages+0x2ca/0x11a0 mm/filemap.c:2580
 filemap_read+0x230/0x8c0 mm/filemap.c:2691
 blkdev_read_iter+0x228/0x2d0 block/fops.c:796
 new_sync_read fs/read_write.c:484 [inline]
 vfs_read+0x5cc/0x6f0 fs/read_write.c:565
 ksys_read+0xe8/0x1b0 fs/read_write.c:708
 __do_sys_read fs/read_write.c:717 [inline]
 __se_sys_read fs/read_write.c:715 [inline]
 __x64_sys_read+0x42/0x50 fs/read_write.c:715
 x64_sys_call+0x2874/0x2dc0 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

value changed: 0x0c -> 0x0a

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 3289 Comm: udevd Not tainted 6.14.0-rc2-syzkaller-00034-gfebbc555cf0f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
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