================================================================== BUG: KCSAN: data-race in ext4_es_lookup_extent / ext4_es_lookup_extent write to 0xffff88814949c390 of 8 bytes by task 17602 on cpu 0: ext4_es_set_referenced fs/ext4/extents_status.h:194 [inline] ext4_es_lookup_extent+0x2ec/0x490 fs/ext4/extents_status.c:968 ext4_map_blocks+0xfd/0xef0 fs/ext4/inode.c:530 ext4_mpage_readpages+0x6d9/0x1130 fs/ext4/readpage.c:304 ext4_readahead+0x99/0xa0 fs/ext4/inode.c:3262 read_pages+0x9f/0x530 mm/readahead.c:130 page_cache_ra_unbounded+0x3a8/0x400 mm/readahead.c:238 ondemand_readahead+0x56f/0x7a0 mm/readahead.c:267 page_cache_sync_ra+0x95/0xd0 mm/readahead.c:577 page_cache_sync_readahead include/linux/pagemap.h:840 [inline] filemap_get_pages mm/filemap.c:2381 [inline] filemap_read+0x380/0x1210 mm/filemap.c:2464 generic_file_read_iter+0x84/0x3e0 mm/filemap.c:2615 ext4_file_read_iter+0x1db/0x290 fs/ext4/file.c:73 call_read_iter include/linux/fs.h:1971 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:311 do_splice_to fs/splice.c:796 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870 do_splice_direct+0xf5/0x170 fs/splice.c:979 do_sendfile+0x773/0xda0 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1325 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae read to 0xffff88814949c390 of 8 bytes by task 17605 on cpu 1: ext4_es_status fs/ext4/extents_status.h:154 [inline] ext4_es_is_referenced fs/ext4/extents_status.h:204 [inline] ext4_es_lookup_extent+0x2ba/0x490 fs/ext4/extents_status.c:967 ext4_map_blocks+0xfd/0xef0 fs/ext4/inode.c:530 ext4_iomap_begin+0x164/0x620 fs/ext4/inode.c:3480 iomap_apply+0x8d/0x400 fs/iomap/apply.c:46 __iomap_dio_rw+0x4c4/0xa10 fs/iomap/direct-io.c:553 iomap_dio_rw+0x30/0x70 fs/iomap/direct-io.c:641 ext4_dio_read_iter fs/ext4/file.c:77 [inline] ext4_file_read_iter+0x21a/0x290 fs/ext4/file.c:128 call_read_iter include/linux/fs.h:1971 [inline] generic_file_splice_read+0x22a/0x310 fs/splice.c:311 do_splice_to fs/splice.c:796 [inline] splice_direct_to_actor+0x2aa/0x650 fs/splice.c:870 do_splice_direct+0xf5/0x170 fs/splice.c:979 do_sendfile+0x773/0xda0 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1325 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0xf2/0x130 fs/read_write.c:1311 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 17605 Comm: syz-executor.0 Tainted: G W 5.12.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================