==================================================================
BUG: KCSAN: data-race in ext4_es_lookup_extent / ext4_es_lookup_extent

read to 0xffff888126ab9428 of 8 bytes by task 10003 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_getblk+0x30b/0x380 fs/ext4/inode.c:974
 ext4_bread+0x4a/0x190 fs/ext4/inode.c:1024
 __ext4_read_dirblock+0x3e/0x700 fs/ext4/namei.c:112
 htree_dirblock_to_tree+0x8c/0x560 fs/ext4/namei.c:997
 ext4_htree_fill_tree+0x179/0x6b0 fs/ext4/namei.c:1116
 ext4_dx_readdir fs/ext4/dir.c:576 [inline]
 ext4_readdir+0x54d/0x1e30 fs/ext4/dir.c:124
 iterate_dir+0x312/0x380 fs/readdir.c:51
 __do_sys_getdents fs/readdir.c:231 [inline]
 __se_sys_getdents fs/readdir.c:212 [inline]
 __x64_sys_getdents+0x14b/0x280 fs/readdir.c:212
 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff888126ab9428 of 8 bytes by task 9999 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_getblk+0x30b/0x380 fs/ext4/inode.c:974
 ext4_bread+0x4a/0x190 fs/ext4/inode.c:1024
 __ext4_read_dirblock+0x3e/0x700 fs/ext4/namei.c:112
 htree_dirblock_to_tree+0x8c/0x560 fs/ext4/namei.c:997
 ext4_htree_fill_tree+0x179/0x6b0 fs/ext4/namei.c:1116
 ext4_dx_readdir fs/ext4/dir.c:576 [inline]
 ext4_readdir+0x54d/0x1e30 fs/ext4/dir.c:124
 iterate_dir+0x312/0x380 fs/readdir.c:51
 __do_sys_getdents fs/readdir.c:231 [inline]
 __se_sys_getdents fs/readdir.c:212 [inline]
 __x64_sys_getdents+0x14b/0x280 fs/readdir.c:212
 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 9999 Comm: modprobe Not tainted 5.3.0+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================