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BUG: KCSAN: data-race in ext4_es_lookup_extent / ext4_es_lookup_extent

read to 0xffff8882185e7c28 of 8 bytes by task 7669 on cpu 1:
 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_batch+0x8a/0x2e0 fs/ext4/inode.c:1044
 __ext4_find_entry+0x32f/0x970 fs/ext4/namei.c:1518
 ext4_lookup_entry fs/ext4/namei.c:1616 [inline]
 ext4_lookup fs/ext4/namei.c:1684 [inline]
 ext4_lookup+0x35f/0x4f0 fs/ext4/namei.c:1675
 __lookup_hash+0xcb/0x110 fs/namei.c:1544
 filename_create+0x102/0x2d0 fs/namei.c:3635
 user_path_create fs/namei.c:3692 [inline]
 do_symlinkat+0x91/0x1e0 fs/namei.c:4147
 __do_sys_symlink fs/namei.c:4173 [inline]
 __se_sys_symlink fs/namei.c:4171 [inline]
 __x64_sys_symlink+0x3f/0x50 fs/namei.c:4171
 do_syscall_64+0xcf/0x2f0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

write to 0xffff8882185e7c28 of 8 bytes by task 7668 on cpu 0:
 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_batch+0x8a/0x2e0 fs/ext4/inode.c:1044
 __ext4_find_entry+0x32f/0x970 fs/ext4/namei.c:1518
 ext4_lookup_entry fs/ext4/namei.c:1616 [inline]
 ext4_lookup fs/ext4/namei.c:1684 [inline]
 ext4_lookup+0x35f/0x4f0 fs/ext4/namei.c:1675
 __lookup_hash+0xcb/0x110 fs/namei.c:1544
 filename_create+0x102/0x2d0 fs/namei.c:3635
 user_path_create fs/namei.c:3692 [inline]
 do_symlinkat+0x91/0x1e0 fs/namei.c:4147
 __do_sys_symlink fs/namei.c:4173 [inline]
 __se_sys_symlink fs/namei.c:4171 [inline]
 __x64_sys_symlink+0x3f/0x50 fs/namei.c:4171
 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: 0 PID: 7668 Comm: syz-executor.2 Not tainted 5.3.0+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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