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BUG: KCSAN: data-race in ext4_es_lookup_extent / ext4_es_lookup_extent

write to 0xffff888218688c28 of 8 bytes by task 7571 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

read to 0xffff888218688c28 of 8 bytes by task 7563 on cpu 1:
 ext4_es_lookup_extent+0x3ba/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

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 7563 Comm: syz-executor.5 Not tainted 5.3.0+ #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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