================================================================== BUG: KCSAN: data-race in do_mpage_readpage / set_blocksize write to 0xffff888101fcc4de of 1 bytes by task 539 on cpu 1: set_blocksize+0x20a/0x270 block/bdev.c:150 sb_set_blocksize block/bdev.c:160 [inline] sb_min_blocksize+0x92/0x110 block/bdev.c:176 __ext4_fill_super fs/ext4/super.c:4346 [inline] ext4_fill_super+0x3b7/0x5010 fs/ext4/super.c:5517 get_tree_bdev+0x2b4/0x3b0 fs/super.c:1323 ext4_get_tree+0x18/0x20 fs/ext4/super.c:5547 vfs_get_tree+0x49/0x190 fs/super.c:1530 do_new_mount+0x200/0x650 fs/namespace.c:3040 path_mount+0x4ad/0xbb0 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount+0x281/0x2d0 fs/namespace.c:3568 __x64_sys_mount+0x63/0x70 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd read to 0xffff888101fcc4de of 1 bytes by task 2527 on cpu 0: do_mpage_readpage+0x6c/0xcf0 fs/mpage.c:137 mpage_readahead+0x27f/0x3a0 fs/mpage.c:361 blkdev_readahead+0x18/0x20 block/fops.c:386 read_pages+0xa5/0x790 mm/readahead.c:158 page_cache_ra_unbounded+0x11f/0x2e0 mm/readahead.c:236 do_page_cache_ra mm/readahead.c:293 [inline] force_page_cache_ra+0x1c6/0x200 mm/readahead.c:324 page_cache_sync_ra+0xc8/0xf0 mm/readahead.c:695 page_cache_sync_readahead include/linux/pagemap.h:1215 [inline] filemap_get_pages mm/filemap.c:2566 [inline] filemap_read+0x3ef/0x1430 mm/filemap.c:2660 blkdev_read_iter+0x2c6/0x370 block/fops.c:598 call_read_iter include/linux/fs.h:2181 [inline] new_sync_read fs/read_write.c:389 [inline] vfs_read+0x3a5/0x560 fs/read_write.c:470 ksys_read+0xe8/0x1a0 fs/read_write.c:607 __do_sys_read fs/read_write.c:617 [inline] __se_sys_read fs/read_write.c:615 [inline] __x64_sys_read+0x3e/0x50 fs/read_write.c:615 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 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: 2527 Comm: udevd Not tainted 6.0.0-rc4-syzkaller-00055-g53e99dcff61e-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 ==================================================================