================================================================== BUG: KCSAN: data-race in ext4_es_lookup_extent / ext4_es_lookup_extent write to 0xffff88821865a428 of 8 bytes by task 7196 on cpu 1: ext4_es_lookup_extent+0x3d3/0x510 fs/ext4/extents_status.c:950 ext4_da_map_blocks fs/ext4/inode.c:1871 [inline] ext4_da_get_block_prep+0x159/0xa60 fs/ext4/inode.c:1992 ext4_block_write_begin+0x33e/0xb90 fs/ext4/inode.c:1202 ext4_da_write_begin+0x1da/0x7e0 fs/ext4/inode.c:3122 generic_perform_write+0x136/0x320 mm/filemap.c:3327 __generic_file_write_iter+0x251/0x380 mm/filemap.c:3456 ext4_file_write_iter+0x1fc/0xa40 fs/ext4/file.c:270 call_write_iter include/linux/fs.h:1870 [inline] new_sync_write+0x388/0x4a0 fs/read_write.c:483 __vfs_write+0xb1/0xc0 fs/read_write.c:496 vfs_write fs/read_write.c:558 [inline] vfs_write+0x18a/0x390 fs/read_write.c:542 ksys_write+0xd5/0x1b0 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x4c/0x60 fs/read_write.c:620 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x44/0xa9 read to 0xffff88821865a428 of 8 bytes by task 7175 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_async_readahead+0x22c/0x250 mm/readahead.c:574 generic_file_buffered_read mm/filemap.c:2079 [inline] generic_file_read_iter+0xffc/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] new_sync_read+0x389/0x4f0 fs/read_write.c:414 __vfs_read+0xb1/0xc0 fs/read_write.c:427 integrity_kernel_read+0xa1/0xe0 security/integrity/iint.c:200 Reported by Kernel Concurrency Sanitizer on: CPU: 0 PID: 7175 Comm: syz-fuzzer Not tainted 5.3.0+ #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ==================================================================