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BUG: KCSAN: data-race in do_mpage_readpage / set_blocksize

write to 0xffff888101fdfa8e of 1 bytes by task 29719 on cpu 1:
 set_blocksize+0x227/0x290 block/bdev.c:151
 sb_set_blocksize block/bdev.c:161 [inline]
 sb_min_blocksize+0x83/0x110 block/bdev.c:177
 ext4_load_super fs/ext4/super.c:5016 [inline]
 __ext4_fill_super fs/ext4/super.c:5213 [inline]
 ext4_fill_super+0x3a6/0x38f0 fs/ext4/super.c:5672
 get_tree_bdev+0x2a8/0x3a0 fs/super.c:1303
 ext4_get_tree+0x1c/0x20 fs/ext4/super.c:5704
 vfs_get_tree+0x51/0x190 fs/super.c:1510
 do_new_mount+0x203/0x660 fs/namespace.c:3039
 path_mount+0x498/0xb40 fs/namespace.c:3369
 do_mount fs/namespace.c:3382 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x27f/0x2d0 fs/namespace.c:3568
 __x64_sys_mount+0x67/0x80 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

read to 0xffff888101fdfa8e of 1 bytes by task 26127 on cpu 0:
 do_mpage_readpage+0x6c/0xdf0 fs/mpage.c:163
 mpage_readahead+0x1b2/0x2d0 fs/mpage.c:382
 blkdev_readahead+0x1c/0x20 block/fops.c:401
 read_pages+0xa6/0x560 mm/readahead.c:161
 page_cache_ra_unbounded+0x2a9/0x2e0 mm/readahead.c:270
 do_page_cache_ra mm/readahead.c:300 [inline]
 force_page_cache_ra mm/readahead.c:331 [inline]
 page_cache_sync_ra+0x251/0x2a0 mm/readahead.c:705
 page_cache_sync_readahead include/linux/pagemap.h:1211 [inline]
 filemap_get_pages+0x257/0xea0 mm/filemap.c:2601
 filemap_read+0x223/0x680 mm/filemap.c:2696
 blkdev_read_iter+0x2ca/0x370 block/fops.c:606
 call_read_iter include/linux/fs.h:1862 [inline]
 new_sync_read fs/read_write.c:389 [inline]
 vfs_read+0x3b7/0x580 fs/read_write.c:470
 ksys_read+0xeb/0x1a0 fs/read_write.c:613
 __do_sys_read fs/read_write.c:623 [inline]
 __se_sys_read fs/read_write.c:621 [inline]
 __x64_sys_read+0x42/0x50 fs/read_write.c:621
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd

value changed: 0x0c -> 0x0a

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 26127 Comm: udevd Not tainted 6.4.0-rc6-syzkaller-00242-g1639fae5132b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
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