UDF-fs: warning (device loop3): udf_load_vrs: No VRS found
UDF-fs: Scanning with blocksize 512 failed
UDF-fs: warning (device loop3): udf_load_vrs: No VRS found
UDF-fs: Scanning with blocksize 1024 failed
==================================================================
BUG: KCSAN: data-race in __add_to_page_cache_locked / set_blocksize

write to 0xffff88814045d810 of 8 bytes by task 3691 on cpu 0:
 __add_to_page_cache_locked+0x3ad/0x6e0 mm/filemap.c:887
 add_to_page_cache_lru+0xa0/0x1b0 mm/filemap.c:940
 page_cache_ra_unbounded+0x272/0x4c0 mm/readahead.c:222
 do_page_cache_ra mm/readahead.c:267 [inline]
 force_page_cache_ra+0x226/0x260 mm/readahead.c:298
 page_cache_sync_ra+0x178/0x1a0 mm/readahead.c:572
 page_cache_sync_readahead include/linux/pagemap.h:840 [inline]
 filemap_get_pages+0x1ba/0x660 mm/filemap.c:2375
 filemap_read+0x1ba/0x7b0 mm/filemap.c:2458
 generic_file_read_iter+0x82/0x410 mm/filemap.c:2609
 blkdev_read_iter+0xb3/0xc0 fs/block_dev.c:1727
 call_read_iter include/linux/fs.h:1971 [inline]
 new_sync_read fs/read_write.c:415 [inline]
 vfs_read+0x565/0x5d0 fs/read_write.c:496
 ksys_read+0xce/0x180 fs/read_write.c:634
 __do_sys_read fs/read_write.c:644 [inline]
 __se_sys_read fs/read_write.c:642 [inline]
 __x64_sys_read+0x3e/0x50 fs/read_write.c:642
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

read to 0xffff88814045d810 of 8 bytes by task 3687 on cpu 1:
 kill_bdev fs/block_dev.c:82 [inline]
 set_blocksize+0x238/0x2a0 fs/block_dev.c:166
 sb_set_blocksize+0x2c/0xa0 fs/block_dev.c:175
 udf_load_vrs+0x59/0x610 fs/udf/super.c:1969
 udf_fill_super+0x4b6/0xd00 fs/udf/super.c:2188
 mount_bdev+0x1e8/0x290 fs/super.c:1367
 udf_mount+0x2d/0x40 fs/udf/super.c:127
 legacy_get_tree+0x70/0xc0 fs/fs_context.c:592
 vfs_get_tree+0x4a/0x1a0 fs/super.c:1497
 do_new_mount fs/namespace.c:2903 [inline]
 path_mount+0x11b9/0x1c00 fs/namespace.c:3233
 do_mount fs/namespace.c:3246 [inline]
 __do_sys_mount fs/namespace.c:3454 [inline]
 __se_sys_mount+0x23d/0x2e0 fs/namespace.c:3431
 __x64_sys_mount+0x63/0x70 fs/namespace.c:3431
 do_syscall_64+0x39/0x80 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 3687 Comm: syz-executor.3 Not tainted 5.12.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
UDF-fs: warning (device loop3): udf_load_vrs: No VRS found
UDF-fs: Scanning with blocksize 2048 failed
UDF-fs: INFO Mounting volume 'LinuxUDF', timestamp 2020/09/19 18:44 (1000)