================================================================== BUG: KCSAN: data-race in ext4_es_lookup_extent / ext4_es_lookup_extent read to 0xffff888126b09c28 of 8 bytes by task 8077 on cpu 0: ext4_es_lookup_extent+0x3ba/0x510 fs/ext4/extents_status.c:950 ext4_map_blocks+0xc2/0xf70 fs/ext4/inode.c:530 ext4_mpage_readpages+0x92b/0x1270 fs/ext4/readpage.c:182 ext4_readpages+0x92/0xc0 fs/ext4/inode.c:3388 read_pages+0xa2/0x2d0 mm/readahead.c:126 __do_page_cache_readahead+0x353/0x390 mm/readahead.c:212 ra_submit mm/internal.h:62 [inline] ondemand_readahead+0x35d/0x710 mm/readahead.c:492 page_cache_sync_readahead+0x1ad/0x1e0 mm/readahead.c:527 generic_file_buffered_read mm/filemap.c:2071 [inline] generic_file_read_iter+0xeb6/0x1440 mm/filemap.c:2344 ext4_file_read_iter fs/ext4/file.c:77 [inline] ext4_file_read_iter+0xfa/0x240 fs/ext4/file.c:65 call_read_iter include/linux/fs.h:1864 [inline] generic_file_splice_read+0x35c/0x500 fs/splice.c:307 do_splice_to+0xf2/0x130 fs/splice.c:877 splice_direct_to_actor+0x1a1/0x510 fs/splice.c:954 do_splice_direct+0x161/0x1e0 fs/splice.c:1063 write to 0xffff888126b09c28 of 8 bytes by task 8074 on cpu 1: ext4_es_lookup_extent+0x3d3/0x510 fs/ext4/extents_status.c:950 ext4_map_blocks+0xc2/0xf70 fs/ext4/inode.c:530 _ext4_get_block+0x12d/0x2b0 fs/ext4/inode.c:791 ext4_get_block_trans+0xf4/0x1d0 fs/ext4/inode.c:852 ext4_dio_get_block_unwritten_sync+0x59/0xc0 fs/ext4/inode.c:924 get_more_blocks fs/direct-io.c:710 [inline] do_direct_IO+0x1409/0x59b0 fs/direct-io.c:995 do_blockdev_direct_IO+0x6b7/0x4cc0 fs/direct-io.c:1327 __blockdev_direct_IO+0x86/0xa0 fs/direct-io.c:1413 ext4_direct_IO_write fs/ext4/inode.c:3788 [inline] ext4_direct_IO+0x6f5/0xf70 fs/ext4/inode.c:3915 generic_file_direct_write+0x14d/0x2e0 mm/filemap.c:3230 __generic_file_write_iter+0x17e/0x380 mm/filemap.c:3413 ext4_file_write_iter+0x1fc/0xa40 fs/ext4/file.c:270 call_write_iter include/linux/fs.h:1870 [inline] do_iter_readv_writev+0x487/0x5b0 fs/read_write.c:693 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 8074 Comm: syz-executor.3 Not tainted 5.3.0+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================